Gaya APA

Berkowski, G. (2015). How to Build a Billion Dollar App : Discover The Secrets Of The Most Successful Entrepreneurs Of Our Time . New York: Piatkus.

Gaya MLA

Berkowski, George. "How to Build a Billion Dollar App : Discover The Secrets Of The Most Successful Entrepreneurs Of Our Time". New York: Piatkus, 2015. Text.