Pmp Exam Prep by Rita Mulcahy (2002, Paperback)

This is a comprehensive study guide and quite helpful. In my reading, however, I do think that the last third of this guide may have been rushed to publication and/or is laden with oversights. Several of the example questions in the last chapters have erroneous and possibly incorrect explanations, but the book as a whole does encourage the test taker to be clear in reading and responding to questions on the actual test.