diff --git a/Doc/library/abc.rst b/Doc/library/abc.rst
index 0302eb5..9fadbd2 100644
--- a/Doc/library/abc.rst
+++ b/Doc/library/abc.rst
@@ -7,6 +7,10 @@
 .. sectionauthor:: Georg Brandl
 .. much of the content adapted from docstrings
 
+**Source code:** :source:`Lib/abc.py`
+
+--------------
+
 This module provides the infrastructure for defining an :term:`abstract base
 class` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
 was added to Python. (See also :pep:`3141` and the :mod:`numbers` module
diff --git a/Doc/library/aifc.rst b/Doc/library/aifc.rst
index 304437d..999bad8 100644
--- a/Doc/library/aifc.rst
+++ b/Doc/library/aifc.rst
@@ -10,6 +10,10 @@
    single: AIFF
    single: AIFF-C
 
+**Source code:** :source:`Lib/aifc.py`
+
+--------------
+
 This module provides support for reading and writing AIFF and AIFF-C files.
 AIFF is Audio Interchange File Format, a format for storing digital audio
 samples in a file.  AIFF-C is a newer version of the format that includes the
diff --git a/Doc/library/asynchat.rst b/Doc/library/asynchat.rst
index 26d3290..75b3cda 100644
--- a/Doc/library/asynchat.rst
+++ b/Doc/library/asynchat.rst
@@ -6,6 +6,9 @@
 .. moduleauthor:: Sam Rushing <rushing@nightmare.com>
 .. sectionauthor:: Steve Holden <sholden@holdenweb.com>
 
+**Source code:** :source:`Lib/asynchat.py`
+
+--------------
 
 This module builds on the :mod:`asyncore` infrastructure, simplifying
 asynchronous clients and servers and making it easier to handle protocols
diff --git a/Doc/library/asyncore.rst b/Doc/library/asyncore.rst
index 8e6c243..b168ca7 100644
--- a/Doc/library/asyncore.rst
+++ b/Doc/library/asyncore.rst
@@ -9,6 +9,9 @@
 .. sectionauthor:: Steve Holden <sholden@holdenweb.com>
 .. heavily adapted from original documentation by Sam Rushing
 
+**Source code:** :source:`Lib/asyncore.py`
+
+--------------
 
 This module provides the basic infrastructure for writing asynchronous  socket
 service clients and servers.