1.) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=506211#null 2.) Esparaza, E., et al. Bioactive maca (Lepidium meyenii) alkamides are a result of traditional Andean postharvest drying practices. Journal of Phytochemistry. Volume 116, August 2015, Pages 138-148 3.) Meissner, H., et al. Peruvian Maca: Two Scientific Names Lepidium Meyenii Walpers and Lepidium Peruvianum Chacon – Are They Phytochemically-Synonymous? International Journal of Biomedical Sciences 2015 Mar; 11(1): 1–15. 4.) Yarnell, Eric. Phytochemistry and Pharmacy for Practitioners or Botanical Medicine. 2003. Healing Mountain Publishing, Inc. 5.) Bussmann, R.W., et al. Traditional medicinal plant use in Northern Peru: tracking two thousand years of healing culture. Journal of Ethnobiology and Ethnomedicine. 2006 2:47 6.) Gonzalez, G. Ethnobiology and Ethnopharmacology of Lepidium meyenii (Maca), a Plant from the Peruvian Highlands. Evid Based Complement Alternat Med. 2012; 2012: 193496. 7.) Stone, M. et al. A pilot investigation into the effect of maca supplementation on physical activity and sexual desire in sportsmen. Journal of Ethnopharmacology. Volume 126, Issue 3, 10 December 2009, Pages 574-576 8.) Zenico, T. et al Andrologia: First International Journal of Andrology. 2009. Vol. 41: 95-99. 9.) Stojanovska, L. et al. Climacteric: 2015; 18:69-78. 10.) Gonzalez, Gustavo et al. Role of maca (Lepidium meyenii) consumption on serum interleukin-6 levels and health status in populations living in the Peruvian central Andes over 4000 m of altitude. Plant Foods Hum Nutr. 2013 December ; 68(4).