Sexual penetration (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Sexual penetration" in English language version.

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archive.org

Starr, Cecie; McMillan, Beverly (2008). Human Biology. Cengage Learning. p. 314. ISBN 978-0495561811. Retrieved April 30, 2013.
Komisaruk, Barry R.; Whipple, Beverly; Nasserzadeh, Sara; Beyer-Flores, Carlos (2009). The Orgasm Answer Guide. JHU Press. pp. 108–109. ISBN 978-0-8018-9396-4. Retrieved November 6, 2011.
Carroll, Janell L. (2009). Sexuality Now: Embracing Diversity. Cengage Learning. pp. 270–271. ISBN 978-0-495-60274-3. Retrieved December 19, 2010.