Added cross-references plus a note about dict & list shallow copying.
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index 92ce02a..650a113 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -8,6 +8,7 @@
This module constructs higher-level threading interfaces on top of the lower
level :mod:`thread` module.
+See also the :mod:`mutex` and :mod:`Queue` modules.
The :mod:`dummy_threading` module is provided for situations where
:mod:`threading` cannot be used because :mod:`thread` is missing.