APA citiranje

(2005). The hardness factor: How to achieve your best health and sexual fitness at any age / Steven Lamm with Gerald Sector Couzens.

Chicago Style (17th ed.) Citation

The Hardness Factor: How to Achieve Your Best Health and Sexual Fitness at Any Age / Steven Lamm with Gerald Sector Couzens. 2005.

MLA citiranje

The Hardness Factor: How to Achieve Your Best Health and Sexual Fitness at Any Age / Steven Lamm with Gerald Sector Couzens. 2005.