van den Berg-Aguilar, R.L. and van den Berg, E. 1997. Teaching physics for non-Science Majors with Hewitt’s Conceptual Physics. Proceedings of the Samahang Pisika ng Pilipinas, 15(1), SPP-1997-ED-08. URL: https://proceedings.spp-online.org/article/view/SPP-1997-ED-08.