If you feel the need for extra reading and insights, two recommended books are
There is a student manual associated with the second book
S. Epp and T. Jenkyns - Student Solutions Manual and Study Guide for Discrete Mathematics with Applications, third edition, Thomson Brooks/Cole 2004, ISBN 0-534-36028-9
There is a copy in the library, call number 511/E64d/2004/Solutions.
These reference books are optional since this unit is entirely covered by the Lectures Notes and the Tutorial and Practice Classes booklets.