- АудиокнигаHow I Raised Myself from Failure to Success in SellingFrank Bettger
- АудиокнигаHow I Raised Myself From Failure to Success in SellingFrank Bettger
- АудиокнигаHow One Idea Increased My Income and HappinessFrank Bettger
- АудиокнигаComo Triunfe en las VentasFrank Bettger
- АудиокнигаHow One Idea Multiplied My Income and HappinessFrank Bettger