MardjanSutrisno Suro, and SurbaktiLeonardo. “Penentuan Kadar Air Dan Kandungan Piperin Lada Hitam (Piper Nigrum L.) Menggunakan Near Infrared Spectroscopy (NIRS)”. Jurnal Keteknikan Pertanian 11, no. 1 (May 30, 2023): 102-115. Accessed July 7, 2024. https://journal.ipb.ac.id/index.php/jtep/article/view/45265.