Analisis Pendapatan dan Efisiensi Teknis Usahatani Ubi Jalar di Kecamatan Ampek Angkek, Kabupaten Agam Provinsi Sumatera Barat. Jurnal Agribisnis Indonesia (Journal of Indonesian Agribusiness), [S. l.], v. 3, n. 1, p. 11–24, 2017. DOI: 10.29244/jai.2015.3.1.11-24. Disponível em: https://journal.ipb.ac.id/jagbi/article/view/15685. Acesso em: 25 dec. 2025.