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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:

\documentclass[10pt,a4paper]{article}
\usepackage{standalone}
\usepackage[english]{babel}
\begin{document}
\tableofcontents
\newpage % Hieronder voeg je de hoofdstukken in
\input{../tex/hoofdstuk1}
\input{../tex/hoofdstuk2}
\newpage
\section*{References}
\bibliography{bibliography.bib}
\end{document}

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?

Mensch
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user105939
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    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. –  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
  • main tex: \documentclass[10pt,a4paper]{article} \usepackage{standalone} \usepackage[english]{babel} \begin{document} \tableofcontents \newpage

    % Hieronder voeg je de hoofdstukken in \input{../tex/hoofdstuk1} \input{../tex/hoofdstuk2} \newpage \section*{References} \bibliography{bibliography.bib}

    \end{document}

     – user105939 May 18 '16 at 11:07
  • When I put in a reference with \cite{} He recognizes the sources I made in the .bib file, but still there comes [?] – user105939 May 18 '16 at 11:10
  • If I press f11 I get this comment: I couldn't open file name `main.aux – user105939 May 18 '16 at 11:34
  • I normally run latex + bibtex + latex + latex on the main tex file. Then, I compile my pdf to see whether the reference shows up. In most of the cases, it does – crypto May 18 '16 at 11:42
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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
  • You have to include a \bibliographystyle{<style>} and you have to remove .bib from the name of the bibliography. – Guido May 18 '16 at 18:09

1 Answers1

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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.

Guido
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