LAYGAN, R. M.; SISON, M. P. 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: 22 dec. 2024.