-"Constants and variables" on page 49, "Object definitions" on page 50,
-"Object relationships -- the object tree" on page 52, "Things in quotes" on
-page 55, and "Routines and statements" on page 56.
+:ref:`const-var`, :ref:`object-defs`, :ref:`object-tree`,
+:ref:`things-in-quotes` and :ref:`routines-statements`.
+
+.. _const-var: