Willingness to Pay for the Quality of Drinking Water. The Pakistan Development Review, [S. l.], v. 46, n. 4II, p. pp.767–777, 2007. DOI: 10.30541/v46i4IIpp.767-777. Disponível em: https://www.thepdr.pk/index.php/pdr/article/view/2220. Acesso em: 6 dec. 2025.