Willingness to Pay For Water at Household Level in Ilorin, Kwara State, Nigeria. Global Journal of Human-Social Science, [S. l.], v. 11, n. 2, p. 15–24, 2011. Disponível em: https://socialscienceresearch.org/index.php/GJHSS/article/view/100060. Acesso em: 20 feb. 2026.