How do I know which version?


I purchased this book a little bit back and title page says Copyright 2011. Front page doesn’t have a third edition or anything, but if I go to purchase it for Kindle says I already purchased this and gives me my date of purchase. How can I make sure I got the latest version??


Disregard I guess there’s only one for Obj-c Programming it’s the ios programming one that’s on the third version. Do I need to purchase it again as well?