G A Geetha, K S Shivashankara, T K Roy,. 2012. “Antioxidant Capacity, Radical Scavenging Ability, Total Phenols and Flavonoids in Three Types of Betelvine (Piper Betle L.)”. Journal of Spices and Aromatic Crops 21 (1):64-67. https://www.updatepublishing.com/journal/index.php/josac/article/view/5000.