If you are planning to take your PMP exam before June 2013, then you don't have to worry. Use PMBOK Guide 4th Edition. Also please see the following video by Mr. Cornelius. In this video he not only answers your question but all the related required information as well.
Please don't hesitate if you have any further question or concern.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®