Use \citetitle in one place.
diff --git a/Doc/lib/libre.tex b/Doc/lib/libre.tex
index 1144fec..bf0a38f 100644
--- a/Doc/lib/libre.tex
+++ b/Doc/lib/libre.tex
@@ -686,7 +686,7 @@
\end{memberdesc}
\begin{seealso}
-\seetext{Jeffrey Friedl, \emph{Mastering Regular Expressions},
+\seetext{Jeffrey Friedl, \citetitle{Mastering Regular Expressions},
O'Reilly. The Python material in this book dates from before the
\module{re} module, but it covers writing good regular expression
patterns in great detail.}