After visiting  on labels and cross-referencing, a couple of tex sites (,), and a  solution, the following reference will not appear in the caption. I'm using pdflatex on ubuntu.   The section label that is being referenced (appen) is defined at the end of the doc. All of the following attempts to insert the reference in the caption produce ?? or [?]:   \begin{figure}[!ht] \caption*{See the ~\ref{appen} for language abbreviations.} \makebox[\textwidth]{\includegraphics[width=100mm]{{/filepath/hourly.update}.pdf}} \end{figure}  \begin{figure}[!ht] \caption*{See the ~\cite{appen} for language abbreviations.} \makebox[\textwidth]{\includegraphics[width=100mm]{{/filepath/hourly.update}.pdf}} \end{figure}  \begin{figure}[!ht] \caption*{See the ~\protect\ref{appen} for language abbreviations.} \makebox[\textwidth]{\includegraphics[width=100mm]{{/filepath/hourly.update}.pdf}} \end{figure}  \begin{figure}[!ht] \caption*{See the ~\protect\cite{appen} for language abbreviations.} \makebox[\textwidth]{\includegraphics[width=100mm]{{/filepath/hourly.update}.pdf}} \end{figure}  \section{Appendix} \label{appen} \subsection{Language Abbreviations}  ...words, figures, tables, and such.   -- edit 2013-02-12  Error received:  LaTeX Warning: Reference `appen' on page 2 undefined on input line 94   Any idea how to insert a reference within a caption?
I've browsed the forums and found a number of posts that have addressed this issue, but none of the solutions seem to work for me. I have the following script that I just copied from the bibtex home page to get familiar with it. Instead of the citation number I get a question mark. I compile using Latex+Bibtex+Latex+Latex+PDFLatex+ViewPDF just as has been previously suggested and the problem persists.   \documentclass[11pt]{article} \usepackage{cite}  \begin{document}  \title{My Article} \author{Nobody Jr.} \date{Today} \maketitle  Blablabla said Nobody ~\cite{Nobody06}.  \bibliography{mybib} \bibliographystyle{plain} \end{document}   My bibliography (Bib.bbl)  @misc{ Nobody06, author = "Nobody Jr", title = "My Article", year = "2006" }    Looking at previous posts one thing that is concerning is that my .bbl looks empty as shown below. Further, I don't have a .blg  \begin{thebibliography}{}  \end{thebibliography}
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