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Chiazze Jr, L; Brayer, FT; MacIsco Jr, JJ; Parker, MP; Duffy, BJ (1968). "The length and variability of the human menstrual cycle". JAMA : the journal of the American Medical Association 203 (6): 377–80. doi:10.1001/jama.203.6.377. PMID 5694118. [2]
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Stern K, McClintock MK (1998). "Regulation of ovulation by human pheromones". Nature392 (6672): 177–9. PMID9515961. doi:10.1038/32408.
Oriel KA, Schrager S (1999). "Abnormal uterine bleeding". American Family Physician60 (5): 1371–80; discussion 1381–2. PMID10524483. Arquivado dende o orixinal o 10 de novembro de 2011. Consultado o 12 October 2008.
Stallings JF, Worthman CM, Panter-Brick C, Coates RJ (1996). "Prolactin response to suckling and maintenance of postpartum amenorrhea among intensively breastfeeding Nepali women". Endocr. Res.22 (1): 1–28. PMID8690004. doi:10.3109/07435809609030495.
Sheila K. and John F. Kippley (November–December 1972). "The relation between breastfeeding and amenorrhea". Journal of obstetric, gynecologic, and neonatal nursing1 (4): 15–21. PMID4485271.
Sheila Kippley (November–December 1986 and January–February 1987). "Breastfeeding survey results similar to 1971 study". The CCL News13 (3): 10. and 13(4): 5.
The National Women's Health Information Center (2002). "What is a typical menstrual period like?". U.S. Department of Health and Human Services. Arquivado dende o orixinal o 02 de marzo de 2007. Consultado o 11 June 2005.
Galan, Nicole (16 April 2008). "Oligoovulation". about.com. Arquivado dende o orixinal o 03 de marzo de 2016. Consultado o 12 October 2008.
Oriel KA, Schrager S (1999). "Abnormal uterine bleeding". American Family Physician60 (5): 1371–80; discussion 1381–2. PMID10524483. Arquivado dende o orixinal o 10 de novembro de 2011. Consultado o 12 October 2008.
Sheila K. and John F. Kippley (November–December 1972). "The relation between breastfeeding and amenorrhea". Journal of obstetric, gynecologic, and neonatal nursing1 (4): 15–21. PMID4485271.
Sheila Kippley (November–December 1986 and January–February 1987). "Breastfeeding survey results similar to 1971 study". The CCL News13 (3): 10. and 13(4): 5.