PMBOK Version 4 was initially released in December 2008. An updated version was released in May 2009. It is important to ensure that consumers are aware if they are purchasing the most recent version of a book especially when it is a professional standard.
It is recommended that the most recent version of PMPOK Version 4 be purchased. The identifier is 10 9 8 7 6 5 4 3 2 and is located at the bottom of the Publisher's information page (2nd page of the text)
