Lesmana, Rina. “Rekomendasi Pemupukan NPK Pada Tanaman Kakao (Theobroma Cacao) Di Desa Metun Sajau Kecamatan Tanjung Palas Timur, Kabupaten Bulungan, Provinsi Kalimantan Utara: Recommendations For NPK Fertilization on Cocoa (Theobroma Cacao) Plants in Metun Sajau Village, East Tanjung Palas Sub-District, Bulungan District, North Kalimantan Province”. Jurnal Ecosolum 11, no. 2 (December 30, 2022): 126–135. Accessed November 21, 2024. https://journal.unhas.ac.id/index.php/ecosolum/article/view/23487.