Berkowitz, R., & Callen, M. (1983). How to have sex in an epedemic: One approach / [by: Richard Berkowitz & Michael Callen] (1. Auflage.). Tower.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerkowitz, Richard, और Michael Callen. How to Have Sex in an Epedemic: One Approach / [by: Richard Berkowitz & Michael Callen]. 1. Auflage. New York: Tower, 1983.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBerkowitz, Richard, और Michael Callen. How to Have Sex in an Epedemic: One Approach / [by: Richard Berkowitz & Michael Callen]. 1. Auflage. Tower, 1983.
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