Mark text as plain text

Question

When inserting a URL in a footnote

\footnote{http://www.bmu-klimaschutzinitiative.de/de/projekte_nki?p=1\&d=450, gesichtet am 21.10.2012}

there are two errors that missing $ signs have been inserted. How can I mark the URL as plain text?

Answer 1

The dedicated url package or the hyperref package will help you here.

url

\documentclass{article}
\usepackage{url}
\begin{document}
\footnote{\url{http://www.bmu-klimaschutzinitiative.de/de/projekte_nki?p=1&d=450}, gesichtet am 21.10.2012}
\end{document}

The font can be changed with \urlstyle (url manual section 3 “Style”, works with hyperref, too):

• \urlstyle{tt}: mono-spaced typewriter font (default)
• \urlstyle{rm}: roman (serif) font
• \urlstyle{sf}: sans-serif font
• \urlstyle{same}: same font as the sourrounding text

hyperref

\documentclass{article}
\usepackage{hyperref}
\begin{document}
\footnote{\url{http://www.bmu-klimaschutzinitiative.de/de/projekte_nki?p=1&d=450}, gesichtet am 21.10.2012}
\end{document}

The hyperref package defines a few other macros that handle URLs:

• \href{<URL>}{<text>}: “The <text> is made a hyperlink to the <URL>.” (not recommended in printed documents)
• \nolinkurl{<URL>}: similar to the output of the url package, no link will be created.

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If you need to use more references in your footnotes, you also might be interested in more automatic solutions.