Cita APA (7th ed.)
Haeberle, E. J. (1986). Spass am sex: Offizielles handbuch fur sicheren sex. German Publishing.
Cita Chicago (17th ed.)
Haeberle, Erwin J. Spass Am Sex: Offizielles Handbuch Fur Sicheren Sex. Zurich: German Publishing, 1986.
Cita MLA (9th ed.)
Haeberle, Erwin J. Spass Am Sex: Offizielles Handbuch Fur Sicheren Sex. German Publishing, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.