N, Ahmad, Ismail F, and Abdul Haiyee Z. 2005. “Determination of Ascorbic Acid, Total Phenolic Content and Antioxidant Activities in Turmeric Leaves of Different Maturity Stages”. Malaysian Journal of Science 24 (1):89-92. https://samudera.um.edu.my/index.php/MJS/article/view/8935.