Poba, Detris, Ijirana Ijirana, and Jamaludin Sakung. “Crude Bromelain Enzyme Activities Based on Maturity Level of Pineapple”. Jurnal Akademika Kimia 8, no. 4 (November 29, 2019): 236-241. Accessed February 3, 2025. https://jurnalfkipuntad.com/index.php/jak/article/view/89.