John, J. “Spectroscopic Studies on a Pigment Isolated from a Tanzanian Variety of Pawpaw ( Carica Papaya - Family Caricacae)”. The Indian Journal of Nutrition and Dietetics, vol. 22, no. 5, May 1985, pp. 154-7, https://informaticsjournals.com/index.php/ijnd/article/view/13131.