Sulman, Lalu. “Isolation of Piperine from Black Pepper (Piper Nigrum) in the Provision of Standard Compounds for Natural Chemical Practice and Research Activities”. Jurnal Pijar Mipa 16, no. 5 (November 30, 2021): 683–687. Accessed February 6, 2023. https://jurnalfkip.unram.ac.id/index.php/JPM/article/view/2981.