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One of the best books, and a must-read, when it comes to learning how to write copy, is [amazon text=Influence&chan=default&asin=B002BD2UUC]
by Robert B. Cialdini.
[amazon template=image&chan=default&asin=B002BD2UUC]
You can check it out and order it from Amazon. It’s a great read, and you’ll learn so much about the psychology behind the decisions people take.