The 3rd edition PMBOK Guide helped me earn the CAPM certification. I know I can't just recommend this book b/c essentially you have to buy it to pass the PMP or CAPM exam. My advice is to read the book over at least twice and understand the processes. Many of the information is repeated such as the inputs for the PM processes and at times you feel like your reading the same thing over and over again.Overall, just take your time learning this stuff and read the book 2-4 times. I personally read it the first time from front to back. Then I read it a second time and highlighted the necessary information. The third time, I just focused on the primary inputs and outputs for each PM process.