Leonard Lowdermilk، Deitra؛ Perry، Shannon E. (2006). Maternity Nursing (ط. 7th). Edinburgh, United Kingdom: Elsevier Mosby. ص. 394. ISBN:978-0-323-03366-4. مؤرشف من الأصل في 2020-08-01.
Levin، Roy J. (نوفمبر 2011). "The human female orgasm: a critical evaluation of its proposed reproductive functions". Sexual and Relationship Therapy. ج. 26 ع. 4: 301–14. DOI:10.1080/14681994.2011.649692. S2CID:143550619.
Levin، Roy J. (نوفمبر 2011). "The human female orgasm: a critical evaluation of its proposed reproductive functions". Sexual and Relationship Therapy. ج. 26 ع. 4: 301–14. DOI:10.1080/14681994.2011.649692. S2CID:143550619.
Leonard Lowdermilk، Deitra؛ Perry، Shannon E. (2006). Maternity Nursing (ط. 7th). Edinburgh, United Kingdom: Elsevier Mosby. ص. 394. ISBN:978-0-323-03366-4. مؤرشف من الأصل في 2020-08-01.