Santoalla, R., J. Cortes, K. Generos, V. Monta, F. Tan, F. Uy, and L. S. Leng. “Hydrologic Modeling and Delineation of Calumpang River Watershed Using GIS and Hydrologic Model System”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1-14, May 2018, pp. 59-62, https://jtec.utem.edu.my/jtec/article/view/3993.