^Hagen, Rose-Marie; Rainer Hagen. What Great Paintings Say, Volume 2. Köln: Taschen. 2002: 433、205 [2013-11-08检索]. ISBN 9783822813720. (原始内容于2020-08-09).引文使用过时参数coauthors (帮助); 请检查|access-date=中的日期值 (帮助)
^Roy J. Levin Reader in Psychology, (Retired). The breast/nipple/areola complex and human sexuality. Sexual and Relationship Therapy. 2006-05-01, 21 (2): 237–249. ISSN 1468-1994. doi:10.1080/14681990600674674.
^Levin, Roy; Meston, Cindy. Nipple/Breast stimulation and sexual arousal in young men and women. The Journal of Sexual Medicine. 2006-05, 3 (3): 450–454 [2020-06-26]. ISSN 1743-6095. PMID 16681470. doi:10.1111/j.1743-6109.2006.00230.x. (原始内容于2021-02-03). (页面存档备份,存于互联网档案馆)
^Roy J. Levin Reader in Psychology, (Retired). The breast/nipple/areola complex and human sexuality. Sexual and Relationship Therapy. 2006-05-01, 21 (2): 237–249. ISSN 1468-1994. doi:10.1080/14681990600674674.
^Komisaruk, Barry R.; Wise, Nan; Frangos, Eleni; Liu, Wen-Ching; Allen, Kachina; Brody, Stuart. Women's clitoris, vagina, and cervix mapped on the sensory cortex: fMRI evidence. The Journal of Sexual Medicine. 2011-10, 8 (10): 2822–2830 [2020-06-26]. ISSN 1743-6109. PMC 3186818. PMID 21797981. doi:10.1111/j.1743-6109.2011.02388.x. (原始内容于2021-01-13). (页面存档备份,存于互联网档案馆)
^Breasts are Best: Can Women Orgasm from Nipple Stimulation?. Luvze. 2011-12-16 [2020-06-26]. (原始内容于2021-01-22) (美国英语). (页面存档备份,存于互联网档案馆)