It is not surprising, then, that you'll need numerous study materials. The good news is that you can choose from a variety of resources and formats designed to fit your individual learning styles and preferences. Here's a short list of essential study materials.
The PMBOK Guide is an essential resource. If you use no other study material to prepare for the PMP exam, use the PMBOK Guide. You cannot pass the exam without it.
PMI members can download a free from the . The PMBOK Guide is also available in a hard copy from online and local bookstores. By the time you are ready to take the PMP Exam, you will have read most of this book at least twice, if not three times.