Use \citetitle in one place.
diff --git a/Doc/lib/libpdb.tex b/Doc/lib/libpdb.tex
index f31db48..a054d42 100644
--- a/Doc/lib/libpdb.tex
+++ b/Doc/lib/libpdb.tex
@@ -384,4 +384,4 @@
 \code{'exception'} event is generated at each level.
 
 For more information on code and frame objects, refer to the
-\emph{Python Reference Manual}.
+\citetitle[../ref/ref.html]{Python Reference Manual}.