Cite references in figure caption

Question

Problem:

Getting error messages when trying to cite a reference in the figure caption. Not sure what I am doing wrong. Can't seem to find that this has been up previously either.

Minimal Working Example:

\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage[pdftex]{graphicx}
\usepackage{epstopdf}
\graphicspath{{figures/}}

\usepackage{apacite}
\bibliographystyle{apacite}

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{rub14,
   author = {Rubin, Jared},
   title = {Printing and {Protestants}: An empirical test of the role of printing in the {Reformation}},
   journal = {Review of Economics and Statistics},
   volume = {96},
   number = {2},
   pages = {270--286},
   year = {2014},
}
\end{filecontents}

\begin{document}
\begin{figure}[htp]
\centering
\includegraphics[width=\textwidth]{conceptdriven.eps}
\caption{\label{fig:researchscope}The process of concept-driven design approach in relation to theory and use situation, adopted from \citeA[p.~282]{rub14}} 
\end{figure}

\bibliography{\jobname}

\end{document}

Desired outcome:

The reference to be directly after the words "adopted from".

Answer 1

The macro \citeA is "fragile", in the LaTeX-specific sense of the word. If it occurs inside a "moving argument" (more LaTeX jargon, sorry), such as the argument of a \caption instruction, one must prefix a \protect instruction:

\caption{\label{fig:researchscope}The process of concept-driven 
  design approach in relation to theory and use situation, 
  adopted from \protect\citeA[p.~282]{rub14}}

For another example of this type, see the posting Using \input{} inside caption.

Answer 2

There is a similar question in StackOverflow.

The problem with the \cite command in the figure caption is that it generates conflicts with the automatic creation of the List of Figures. So the first option is to put an alternative caption into brackets:

\caption[test caption]{test caption from~\cite{MyCite}}

You can also use the \protect environnement as suggested in the comments:

\caption{test caption from~\protect\cite{MyCite}}

As for your minimal working example, you could do it as follows:

\documentclass{book}
  \usepackage[utf8]{inputenc}
  \usepackage[pdftex]{graphicx}
  \usepackage{epstopdf}
  \graphicspath{{figures/}}

  \usepackage{lipsum} % just for the example

  \usepackage{apacite}
  \bibliographystyle{apacite}

  \usepackage{filecontents}
  \begin{filecontents}{\jobname.bib}
  @article{rub14,
     author = {Rubin, Jared},
     title = {Printing and {Protestants}: An empirical test of the role of printing in the {Reformation}},
     journal = {Review of Economics and Statistics},
     volume = {96},
     number = {2},
     pages = {270--286},
     year = {2014},
  }
  \end{filecontents}

  \begin{document}
    \listoffigures

    \vspace{0.5cm}
    \lipsum[3]
    \begin{figure}[htp]
      \centering
      \includegraphics[width=8cm,height=5cm]{sample_pic}%
      %\includegraphics[width=\textwidth]{conceptdriven.eps}
      \caption[The process of concept-driven design approach in relation to theory and use situation]{The process of concept-driven design approach in relation to theory and use situation, adopted from~\citeA[p.~282} 
      \label{fig:researchscope}
    \end{figure}

    \lipsum[2]
    \bibliography{\jobname}

   \end{document}

And the output would look like:

Answer 3

This problem might appear because you have citations in the captions of your figures/tables that then show up earlier than wanted (in the List of Figures LoF or Tables) in your bibliography.

A solution here is to use the optional argument to \caption:

\caption[caption for LoF]{caption in text \cite{<reference>}}

The optional argument is then what's shown in the LoF and would not have the citation.

This solution works well.