This question already has an answer here:

I get this error when I try to run my file. I try to put in a reference, but I only got [?]. This is the main document:

\newpage % Hieronder voeg je de hoofdstukken in

And this is the .bib file. enter image description here

In the file hoofdstuk2 I refer to a source like this: \cite{Tsao2013558} I don't understand why my reference is displayed as [?]. Can someone help me?

marked as duplicate by Werner, Maarten Dhondt, Jesse, Svend Tveskæg, user13907 May 18 '16 at 18:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 3
    Welcome to TeX.SX! Rather than posting screenshots it is much better to post the actual code (and then highight it using the {} symbol in the gui). This makes it much easier for people to help you because they can cut-and-paste your code, allowing them to easily edit and test it on their own system. – Andrew May 18 '16 at 10:52
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    Did you run pdfLaTeX(F6), then BibTeX (F11) and then pdfLaTeX (F6) twice? – Torbjørn T. May 18 '16 at 10:54
  • I did but it is stel not working. – user105939 May 18 '16 at 11:06
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    Possible helpful: Question mark instead of citation number – Richard May 18 '16 at 12:28
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    If the post Sam linked doesn't help you, I suggest you post also the raw text of your .bib file (at least the relevant part). And also hoofdstuk2.tex. Please don't post it as a comment but edit your question. I did part of that so that you can see how it works. This will increase your chances of getting help – sheß May 18 '16 at 16:47

The problem with the given MWE is that it does not contain a \bibiographystyle thus bibtex stops with the error

I found no \bibstyle command---while reading file hoofdstuk2..aux
(There was 1 error message)

and it does not produce a .bbl file.

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