Bhaskarachary, K., J. Sreenivasa Rao, and T. Longvah. 2011. “Effect of Seasonal and Diurnal Variation in Carotenoid Content of Green Leafy Vegetables”. The Indian Journal of Nutrition and Dietetics 48 (12):522-28. http://informaticsjournals.com/index.php/ijnd/article/view/4617.