Three wholly enlightening page-turners are used as reference books in the PS Professional Athlete training course. What does this mean? Well, that the course is intended for everyone. The course itself draws from popular nonfiction – some of which has stood the test of time. How to Win Friends and Influence People was first published in 1936 and continues to inform readers about getting out of a mental rut, interacting well with other people and transforming all relationships.