BACHREIN, Saeful. Penelitian Sistem Usaha Pertanian di Indonesia. Analisis Kebijakan Pertanian, [S. l.], v. 4, n. 2, p. 109–130, 2017. DOI: 10.21082/akp.v4n2.2006.109-130. Disponível em: https://epublikasi.pertanian.go.id/berkala/index.php/akp/article/view/667. Acesso em: 4 jun. 2025.