“Analisis Sifat Fisika Dan Kimia Lignin Tandan Kosong Kelapa Sawit Asal Desa Sape, Kabupaten Sanggau, Kalimantan Barat”. Jurnal Kimia Valensi 2, no. 1 (May 31, 2016): 24–29. Accessed November 29, 2025. https://journal.uinjkt.ac.id/valensi/article/view/3102.