Betty, Betty, Sandra Arifin Aziz, and Ketty Suketi. “The Effects of Different Rates of Chicken Manure and Harvest Intervals on the Bioactive Compounds of Bitter Leaf (Vernonia Amygdalina Del.)”. Journal of Tropical Crop Science 8, no. 02 (July 4, 2021): 80–88. Accessed February 22, 2026. https://www.j-tropical-crops.com/index.php/agro/article/view/373.