An Economic Valuation of Freshwater Ecosystem Services in Lawis River Spring, Buruun Iligan City. Asia Pacific Journal of Social Innovation, [S. l.], v. 32, n. 1, p. 45–67, 2019. Disponível em: https://journals.msuiit.edu.ph/tmf/article/view/53. Acesso em: 20 may. 2026.