- Mark B. Kristal (2 February 1980), “Placentophagia: A Biobehavioral Enigma”,Neuroscience & Biobehavioral Reviews 4: 141–150, archived from the original on September 30, 2007, retrieved 2007-12-12
- Mark B. Kristal (May 2012), “Placentophagia in Humans and Nonhuman Mammals: Causes and Consequences”, Ecology of Food and Nutrition
- Mark B. Kristal (1991), “Enhancement of Opioid-Mediated Analgesia: A Solution to the Enigma of Placentophagia”, Neuroscience and Biobehavioral Reviews
- SM Young and DC Benyshek. “In Search of Human Placentophagy: A Cross-Cultural Survey of Human Placenta Consumption, Disposal Practices, and Cultural Beliefs”. Ecol Food Nutr. 2010 Nov-Dec;49(6):467-84. Retrieved 20 June 2012. Abstract at NIH website, accessed 20 June 2012
- Apari P, Rózsa L (2006), “Deal in the womb: fetal opiates, parent-offspring conflict, and the future of midwifery”, Medical Hypotheses 67 (5): 1189–1194,doi:10.1016/j.mehy.2006.03.053
, PMID 16893611
- Why eat a placenta?, BBC News, 2006-04-18, retrieved 2007-12-12
- Bawany, Afsha (February 27, 2013). “Steamed, Dehydrated or Raw: Placentas May Help Moms’ Post-Partum Health. UNLV anthropology survey examines why women consume their placentas after childbirth.”. UNLV News Center. Retrieved March 25, 2013.
- J. Selender, A. Cantor, S. Young, and D. Benyshek. “Human Maternal Placentophagy: A Survey of Self-Reported Motivations and Experiences Associated with Placenta Consumption”. Ecology of Food and Nutrition. Retrieved March 25, 2013.
- Jump up ^ Traditional Chinese medicine contains human placenta, News-Medical.Net, May 8, 2004, retrieved 2007-12-12
- Tierra, Lesley; Tierra, Michael (1998), Chinese traditional herbal medicine, Twin Lakes, WI: Lotus Light Pub, pp. 225, ISBN 0-914955-32-2
- “Channel 4 rapped for serving placenta”. BBC. Retrieved 17 December 2012.