Mrthfx

Biblatex allows multiple bibliographies to be printed. How do I make one bilbiography use author-year style while make another use a numerical style? I've heard that this is bad typography but I want to do it to distinguish between actual references to literature (author-year) and image credits (which I hope to do numerically).

I've read through the Biblatex documentation and it doesn't seem to help.

After much searching on Tex.StackExchange, I put together a hack that produced this:

I hope my code will be of use to others who want to do something similar.

Code:

documentclass{article}

usepackage[backend=biber, %I think this should work for BibTex too, but I'm not sure.

  style=authoryear, %Set author-year as the default style; later hacks will produce a fake numeric style.

  defernumbers %Works together with resetnumbers so that the numbering of numeric entries is independent of the author-year citations.

  ]{biblatex}

addbibresource{Bibliography.bib}



%Copied from numeric.cbx to imitate numerical citations.

providebool{bbx:subentry}

newbibmacro*{citenum}{%Note: the original macro was called "cite". I did not redefine "cite", but instead defined a new macro "citenum", because the author-year citations use the "cite" macro too. "renewbibmacro*{cite}" would have caused all the author-year citations to become numeric too.

  printtext[bibhyperref]{%If you ever want to use hyperref

    printfield{prefixnumber}%

    printfield{labelnumber}%

    ifbool{bbx:subentry}

      {printfield{entrysetcount}}

      {}}}



%Copied from numeric.cbx to define a new numeric citation command for @online entries.

DeclareCiteCommand{conline}[mkbibbrackets]

  {usebibmacro{prenote}}

  {usebibmacro{citeindex}%

   usebibmacro{citenum}}%Note: this was originally "cite" but I changed it to "citenum" to avoid clashes with the author-year style.

  {multicitedelim}

  {usebibmacro{postnote}}



begin{document}

Cite books, parencite{Book} parencite{Book2}



Cite online stuff, conline{Online} conline{Online2}



%Print the normal author-year bibliography

printbibliography[nottype=online]



%Redefine the bibliography environment to imitate the numeric citation style

defbibenvironment{bibliography}

{list

{printfield[labelnumberwidth]{labelnumber}}

{setlength{labelwidth}{labelnumberwidth}%

setlength{leftmargin}{labelwidth}%

setlength{labelsep}{biblabelsep}%

addtolength{labelsep}{1em}

addtolength{leftmargin}{labelsep}%

setlength{itemsep}{bibitemsep}%

setlength{parsep}{bibparsep}}%

renewcommand*{makelabel}[1]{hss##1}}

{endlist}

{item}

DeclareFieldFormat{labelnumberwidth}{mkbibbrackets{#1}hspace{-1.1em}}

printbibliography[type=online,title=Online,resetnumbers]

end{document}

The file Bibliography.bib contains:

@book{Book,

  author    = {Author},

  title     = {Title},

  publisher = {Publisher},

  year      = {2014},

}



@book{Book2,

  author    = {Author2},

  title     = {Title2},

  publisher = {Publisher2},

  year      = {2015},

}



@online{Online,

  author = {Author},

  title = {Title},

  titleaddon = {titleaddon},

  subtitle = {subtitle},

  url= {http://tex.stackexchange.com/},

}



@online{Online2,

  author = {Author2},

  title = {Title2},

  titleaddon = {titleaddon2},

  subtitle = {subtitle2},

  url= {http://tex.stackexchange2.com/},

}

Talking about distinguishing between literature and credits, I need something similar.

So, an experiment: (not in mixing two styles, but in having two streams of information)

Using an extended author-title style as a base (ext-authortitle-ibid) to make things easier, and adding photographer and photoname as fields to use in an @photo bib entrytype, and using a counter to number the cited photos in sequence and printing that number as part of the citation (with a custom photocite), and a corresponding bib driver (DeclareBibliographyDriver{photo}), and using a keyword, "photo", to split the bibliographies, and remembering to reset the photocounter to zero just before the photo bibliography prints (and to keep the photo bibliography unsorted as well (via a refcontext) so it, too, is in citation order), we get:

MWEB

RequirePackage{filecontents}



%dbx

%bbx

%cbx

%lbx

%bib

%ist





%:::::::::::::::::::::::::::::::::::::::::::::

begin{filecontents*}{photo.dbx}

DeclareDatamodelFields[type=field, datatype=literal]{

  photoname,

  photographer,

}

DeclareLanguageMapping{english}{english-photo}





endinput

end{filecontents*}

%====================================











%:::::::::::::::::::::::::::::::::::::::::::::

begin{filecontents*}{photo.bbx}

ProvidesFile{photo.bbx}[2006/04/09 v1.0 biblatex bibliography style]

RequireBibliographyStyle{ext-authortitle-ibid}

%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

DeclareBibliographyDriver{photo}{%

    usebibmacro{begentry}

    usebibmacro{photo-count}addspaceusebibmacro{photoby-bib}

    usebibmacro{finentry}

}









DeclareSortingTemplate{photosort}{

sort{

    field{photographer}

    }

sort{

    field{photoname}

    }

}







newcounter{photonum}

setcounter{photonum}{0}

newcommandincrphotonum{refstepcounter{photonum}}





endinput

end{filecontents*}

%====================================







%:::::::::::::::::::::::::::::::::::::::::::::

begin{filecontents*}{photo.cbx}

ProvidesFile{photo.cbx}[2019-04-09 v1.0 biblatex citation style]

RequireCitationStyle{ext-authortitle-ibid}



%~~~~~~~~~~~~~~~~~~~

% fieldformats: photo

DeclareFieldFormat{photoname}{mkbibquote{#1}}

DeclareFieldFormat{photographer}{#1}





%~~~~~~~~~~~~~~~~~~~

% bibmacros

%======================= photoname

newbibmacro{getphotoname}{%

      printfield{photoname}%

}



%======================= photographer

newbibmacro{getphotographer}{%

    printfield{photographer}%

}

%======================= photoby-caption

newbibmacro{photoby-caption}{%

      iffieldundef{photoname}{}{usebibmacro{getphotoname}}%

    iffieldundef{photographer}{}{addspacemkbibparens{usebibmacro{getphotographer}}}%

}





%======================= photoby-bib

newbibmacro{photoby-bib}{%

      iffieldundef{photoname}{}{usebibmacro{getphotoname}}%

    iffieldundef{photographer}{}{addcommaaddspacebibstring{photoby}addspaceusebibmacro{getphotographer}isdot}%

}





newbibmacro{photo-count}{%

incrphotonummkbibbrackets{thephotonum}

}



%~~~~~~~~~~~~~~~~~~~

% citecommands

%======================= photocite

DeclareCiteCommand{photocite}%

%@@@@@@@@@@@@@@@@ prenote

{%

    usebibmacro{prenote}%

}% 

%@@@@@@@@@@@@@@@@ item

{%

ifentrytype{photo}%

{%photo ==================================

    usebibmacro{photo-count}addspaceusebibmacro{photoby-caption}%

}{}}%

%@@@@@@@@@@@@@@@@ delim

{}%

%@@@@@@@@@@@@@@@@ postnote

{%

    usebibmacro{postnote}% 

}













endinput

end{filecontents*}

%====================================



%====================================

begin{filecontents*}{english-photo.lbx}

  ProvidesFile{english-photo.lbx}[2019/04/09 english with additions for photo citations]

  InheritBibliographyExtras{english}

  NewBibliographyString{photoby}

  DeclareBibliographyStrings{%

    inherit   = {english},

    photoby = {{photo by}{photo by}},

  }



endinput

end{filecontents*}

%====================================













%====================================

begin{filecontents*}{jobname.bib}



@photo{ph1,

photoname={The Woods},

photographer={M Woods},

keywords={photo},

}



@photo{ph2,

photoname={The Sky},

photographer={A B Skier},

keywords={photo},

}

@photo{ph3,

photoname={The Air},

photographer={O Ayre},

keywords={photo},

}

@photo{ph4,

photoname={The Lake},

photographer={N Lakes},

keywords={photo},

}

@photo{ph5,

photoname={The Sea},

photographer={R Seasons},

keywords={photo},

}



end{filecontents*}

%====================================

















documentclass[12pt]{article}

usepackage{fontspec}

setmainfont{Noto Serif}

usepackage[british]{babel}

usepackage{csquotes}





usepackage[

    style=photo, 

        ]{biblatex}

defbibnote{abibnote}{Plain bibliography}

defbibnote{photobibnote}{List of photos}





usepackage{xcolor}

pagecolor{red!3}



addbibresource{biblatex-examples.bib}

addbibresource{jobname.bib}



begin{document}

section{Introduction}

Some plain cites: 

cite{kastenholz} 

cite{vangennep}



Some photo cites: air: photocite{ph3}, sky: photocite{ph2}, and sea: photocite{ph5}. 



printbibliography[prenote=abibnote,notkeyword=photo]





setcounter{photonum}{0}

newrefcontext[sorting=none]

printbibliography[

    keyword=photo,

    title={Photos},

    prenote=photobibnote,

    ]



begin{center}

textemdash

textemdash

end{center}

end{document}

Being able to classify the data into categories is key: entrytype and keyword help here (and also category, for that matter). The information could even be stored in, say, the @article entrytype with appropriate use of ifentrytype and ifkeyword (manual: 4.6.2 Stand-alone Tests, at p 233). There is also an entrysubtype available, for even greater granularity.

Printing the citations rotated sideways (and/or as part of captions) is also possible.

On a different solution path, different bib environments (to define what gets printed as the lookup label) combined with different sorting schemes is another methodology, since bibliographies are "just" list environments.