Tapia, A.K.G., Amada, M.R., Catedral, M.D., Tabajonda, R.V. and Uriarte, N.G.T. 2006. Home-made physics learning tools. Proceedings of the Samahang Pisika ng Pilipinas, 24(1), SPP-2006-WS-09. URL: https://proceedings.spp-online.org/article/view/SPP-2006-WS-09.