Laygan, R. M. and Sison, M. P. (2019) “An Economic Valuation of Freshwater Ecosystem Services in Lawis River Spring, Buruun Iligan City”, ASIA PACIFIC JOURNAL OF SOCIAL INNOVATION, 32(1), pp. 45–67. Available at: https://journals.msuiit.edu.ph/tmf/article/view/53 (Accessed: 17 September 2024).