Thammanna Gowda, S. S., and L. Srinivas. “Methi Leaves (Trigonella Foenum-Graecum): An Edible Rich Source of Lutein”. The Indian Journal of Nutrition and Dietetics, vol. 47, no. 4, Apr. 2010, pp. 167-70, https://www.informaticsjournals.com/index.php/ijnd/article/view/4802.