What I Want

I want my reference output to look like this for all online resources who do have all the values to fill out all of the following fields:

{NAME},{First Name},{Publishing year}. Titel des Artikels: {Subtitle}. In: {Name of the newspaper} [online]. {Publishing date of the article}[Zugriff am: {tt.mm.jjjj}]. Verfügbar unter: {DOI | URL}.

Note: Everything in {} should be replaced with an actual value.

An example:

BRÖHM, Alexandra, 2016. Biometrische Systeme: Ein Passwort kann man ändern, die eigene Iris nicht. In: Süddeutsche Zeitung [online]. 01.09.2016 [Zugriff am: 21.08.2017]. Verfügbar unter: http://www.sueddeutsche.de/digital/biometrische-systeme-ein-passwort-kann-man-aendern-die-eigene-iris-nicht-1.3144344.

The Code

I'm using Overleaf with pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018). In my preamble I've got the following code:

%Bibliography management 


%Silence annoying warnings e.g.: Package biblatex Warning: File 'german-ieee.lbx' not found!
\WarningFilter{biblatex}{File 'ngerman-ieee.lbx'}
\WarningFilter{biblatex}{File 'german-ieee.lbx'}
\WarningFilter{biblatex}{File 'english-ieee.lbx'}

% for using multiple files

What I've tried

I've tried to use \DeclareFieldFormat{urldate}{\mkbibbrackets{Zugriff am Tag: \bibstring{urldate}\space#1}}, but this always gives me the error Package biblatex Warning: Bibliography string 'urldate' undefined at entry [...] and I've searched for a style or package which does this by default for me, but could not find any.

1 Answer 1


There is indeed no biblatex bibstring called urldate. Did you perhaps mean urlseen? But you probably don't need it, as you've already hardcoded Zugriff am Tag.


\DeclareFieldFormat{urldate}{\mkbibbrackets{Zugriff am Tag:\space#1}}

should work; though you might want to make things a bit more streamlined with


  urlseen = {Zugriff am}


Note that you don't need \bibliography{references}: just \addbibresource{reference.bib} is enough.

  • I slightly reworded the first sentence to avoid mentioning 'label' and 'key' because those words could be mistaken for technical terms like entry key and (citation/alphabetic/numeric) label. While I was at it I also moved the colon from the bibstring to the field format (usually there is no trailing punctuation in bibstrings). Feel free to revert this edit if you disagree.
    – moewe
    Nov 20, 2019 at 6:40
  • @moewe Not at all, thanks for the edit!
    – imnothere
    Nov 20, 2019 at 7:10
  • Could you please clarify why urldate is no biblatex string? I can use such a string in my .bib file without any errors or warnings. I'm also wondering how I can get the URL part working as it would have to be moved to the end and this (online) part is only visible with langid={English} which does of course not work with the DefineBibliographyStrings{ngerman}. Nov 20, 2019 at 11:09

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