Haeberle, E. J. (1986). Spass am sex: Offizielles handbuch fur sicheren sex. German Publishing.
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芝加哥风格引文
Haeberle, Erwin J. Spass Am Sex: Offizielles Handbuch Fur Sicheren Sex. Zurich: German Publishing, 1986.
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MLA引文
Haeberle, Erwin J. Spass Am Sex: Offizielles Handbuch Fur Sicheren Sex. German Publishing, 1986.
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警告：这些引文格式不一定是100％准确.