I'm trying to cite a website using pdflatex, better-bibtex, zotero and texmaker. Citations of articles are working like charm, but I get an error with the citation of a websites:

Warning: Citation `xxx' on page y undefined on input line

The automatically create bibtex entry from zotero is the following:

  title = {{{OGRE}} - {{Open Source 3D Graphics Engine}}},
  language = {en-US},
  journal = {OGRE - Open Source 3D Graphics Engine},
  howpublished = {https://www.ogre3d.org/},
  author = {{Ogre Development Team}},
  year = {2019},

I'm loading my references like this:


And I'm using the following document class:

\documentclass[journal, article, submit, moreauthors, pdftex, atmosphere]{Definitions/mdpi}

In my text I'm citing the website like this:


And I'm building my whole document like this:

PdfLatex + Bibtex + PdfLatex (x2) + Show PDF

All other citations are working..

  • 1
    Please -- as usual here -- make your code snippets compilable, then we do not have to guess what you are doing. Do you have a link to your used class mdpi?
    – Mensch
    Mar 15, 2019 at 13:58
  • If I download the template from mdpi.com/authors/latex and modify template.tex to use BibTeX (i.e. remove the manual thebibliography References, variant A and uncomment variant B), add the example entry to a .bib file, cite ogredevelopmentteamOGREOpenSource2019 and compile with LaTeX, BibTeX, LaTeX, LaTeX, I get the expected output. Delete the temporary files and try again. Double check the .bib file contains the entry and that it is the correct .bib file. What does the blg file say?
    – moewe
    Mar 15, 2019 at 14:42

2 Answers 2


The entry type for websites defined in mdpi.bst is www. Your example would look like this:

    author = {{Ogre Development Team}}, 
    title = {{{OGRE}} - {{Open Source 3D Graphics Engine}}},
    url = {https://www.ogre3d.org/},
    urldate = {xx.xx.2019},

(urldate is the date on which the website was accessed)


Firstly, If you do not know how to generate website citation, use any online generator citation (for example, http://www.citationmachine.net). Secondly, create your your_ref.bib file (if you do not know, you can use mendely to export your_ref.bib file). Thirdly, replace ( \bibliography{your_ref.bib} instead of \bibliography{your_external_BibTeX_file}

  • This doesn't seem to answer the question.
    – Werner
    May 22, 2019 at 16:35
  • I faced this error and fixed it by following these steps May 23, 2019 at 1:50

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