"Sexual Intercourse". Discovery.com. Archived from the original on 2008-08-22. Retrieved 2008-01-12.
Michael R. Solomon, editor (1986). Text and Concordance of Speculum al foderi, Biblioteca Nacional MS. 3356. ISBN 0-942260-60-0
Michael R. Solomon (1990). The Mirror of coitus : a translation and edition of the fifteenth-century Speculum al foderi. Spanish. ISBN 0-940639-48-3
Keath Roberts (2006). Sex. Lotus Press. p. 145. ISBN 8189093592. Retrieved August 17, 2012.
Wayne Weiten; Margaret A. Lloyd; Dana S. Dunn; Elizabeth Yost Hammer (2008). Psychology Applied to Modern Life: Adjustment in the 21st Century. Cengage Learning. p. 423. ISBN 0495553395. Retrieved January 5, 2012.
Nafzawi, Muhammad ibn Muhammad al, and Jim Colville (trans.). The Perfumed Garden of Sensual Delight. The Kegan Paul Arabia library, vol. 7. London: Kegan Paul, 1999.
The Perfumed Garden, Shaykh Nefwazi [sic], translated by Sir Richard Francis Burton, 1886. full text available at Internet Sacred Text Archive
Comfort, Alex, The Joy of Sex: Fully Revised & Completely Updated for the 21st Century. Crown. Fully rev. ed., 2002. ISBN 1-4000-4614-9, 256 pages.
Rogiere, Jean, The Little Book of Sex. Ulysses Press, 2001. ISBN 1-56975-305-9, 96 pages.
"Bulldog Sex Position". SexInfo101.com. Retrieved 2015-01-08.
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