NORMAN, W. R.; WALTER, M. F. Farmer Water Costs and Related Performance in Irrigated Systems: Case Studies from the Sahel. Journal of Agricultural and Marine Sciences [JAMS], [S. l.], v. 2, p. 1–12, 1997. Disponível em: https://journals.squ.edu.om/index.php/jams/article/view/495. Acesso em: 4 may. 2024.