Hamble, R. (1991). What's wrong with my Willy? (1. Auflage.). GMP Publishers.
Citazione stile Chigago Style (17a edizione)Hamble, Ray. What's Wrong with My Willy? 1. Auflage. London: GMP Publishers, 1991.
Citatione MLA (8a ed.)Hamble, Ray. What's Wrong with My Willy? 1. Auflage. GMP Publishers, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.