2. How do you know if it’s POD or the official copy before purchasing on Amazon?


You can tell by checking “Product Details” section.  


1) POD has the ASIN number, while the official copy has the ISBN 10 Number. 


2) You can also check the “Publisher” information on the details. For POD versions, it usually says “Amazon” or “Independently Published.” For the official copies, it will say “Darakwon” as the publisher.