APA (7th ed.) Citation

Hamble, R. (1991). What's wrong with my Willy? (1. Auflage.). GMP Publishers.

Chicago Style (17th ed.) Citation

Hamble, Ray. What's Wrong with My Willy? 1. Auflage. London: GMP Publishers, 1991.

MLA (8th ed.) Citation

Hamble, Ray. What's Wrong with My Willy? 1. Auflage. GMP Publishers, 1991.

Warning: These citations may not always be 100% accurate.