TINJAUAN MATEMATIS MODEL USAHA KOPI TANI TERPADU DALAM RANGKA PENYEDIAAN PANGAN, ENERGI SERTA KENYAMANAN LINGKUNGAN YANG BERKELANJUTAN. PROCEEDINGS OF NATIONAL COLLOQUIUM RESEARCH AND COMMUNITY SERVICE, [S. l.], v. 1, 2018. DOI: 10.33019/snppm.v1i0.498. Disponível em: https://www.journal.ubb.ac.id/index.php/snppm/article/view/498. Acesso em: 23 may. 2026.