# How to get onecolumn appendix in twocolumn book documentclass

I'm writing an essay in \documentclass[a4paper,11pt,twocolumn]{book}. The entire work is in twocolumn but I need the appendix to be onecolumn. I tried using \onecolumn but is adds 2 blank pages and the titles within the appendix appear on the bottom of the page?

How can I fix this?

\documentclass[a4paper,11pt,twocolumn]{book}
\begin{document}
\maketitle
\tableofcontents
\input{theory}

\onecolumn
\appendix
\input{information}

\nocite{*}
\bibliographystyle{unsrt}
\bibliography{bib}

\end{document}

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Welcome to tex.sx, you can indent by four spaces or highlight and use the {} button for code sections and use a backtick for inline code. – David Carlisle Mar 4 at 19:59
Clearly titles should not be at the bottom of the page so there is an error in your markup, but we can not see it or run the posted example. Please try to edit the example to show the problem, in a way that can be run on other sites, perhaps remove \bibliography{bib} and \input{theopry} and replace \input{information} with the minimum amount of text that shows the problem, presumably that file has some \chapter and \section commands? – David Carlisle Mar 4 at 20:04

Try putting the command \onecolumn inside the file information.tex. Don't forget to save the amended file.

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