JOSEPH M.; HAMIDU, K.; IDENYI, E.S.; OCHEJA, P.I.; AGIENI, C. M. COST AND RETURNS OF SOLE COWPEA PRODUCTION IN THE NORTHERN AGRICULTURAL ZONE OF ADAMAWA STATE. African Journal of Agricultural Science and Food Research, [S. l.], v. 3, n. 1, p. 01–10, 2022. Disponível em: https://publications.afropolitanjournals.com/index.php/ajasfr/article/view/31. Acesso em: 27 oct. 2026.