Use \emph{} for all references to the other documents, not just some of them.
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index d33928c..4483a2c 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -49,10 +49,10 @@
This manual assumes basic knowledge about the Python language. For an
informal introduction to Python, see the \emph{Python Tutorial}; the
-Python Reference Manual remains the highest authority on syntactic and
-semantic questions. Finally, the manual entitled \emph{Extending and
-Embedding the Python Interpreter} describes how to add new extensions
-to Python and how to embed it in other applications.
+\emph{Python Reference Manual} remains the highest authority on
+syntactic and semantic questions. Finally, the manual entitled
+\emph{Extending and Embedding the Python Interpreter} describes how to
+add new extensions to Python and how to embed it in other applications.
\end{abstract}