Hi,
I'm just starting to study for the PMP exam (almost a year after doing the course).

The only study material I have so far is Rita's 6th edition book.

My question is should I purchase the PMBOK 4th edition? If so, is this the book I need - http://www.amazon.co.uk/PMBOK-Fourth-Edition-Pocket-Guides/dp/908753518X/ref=sr_1_2?ie=UTF8&qid=1335197089&sr=8-2 ?