Paguigan, G J, and D C Jacinto. “Carbon Footprint Inventory of Buildings in Isabela State University: Benchmark for Future Design Alternatives”. KnE Social Sciences 3, no. 6 (June 4, 2018): 506–521. Accessed November 28, 2021. https://knepublishing.com/index.php/KnE-Social/article/view/2401.