It will be better to get the most updated version - there's no point studying from an out-of-date text book! There are enough changes to make it worthwhile, in my view.
A lot of Amazon books have second-hand options. Check all the sellers and see if any of them are selling second-hand books. Also I use ebay sometimes for second-hand books.
I am to start studying for the CAPM Exam and I would like to get the Rita Mulcahy's CAPM Exam Prep book. I have the 3rd edition but I think its better if I can get the last edition.
Anyone knows where I can buy a second hand book?
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®