Oliva, K.B., Valenzuela, J.F.B. and Herrera, M.U. 2005. Post-course evaluation of students’ conceptions regarding equipotential lines, electric field and electric flux. Proceedings of the Samahang Pisika ng Pilipinas, 23(1), SPP-2005-PA-10. URL: https://proceedings.spp-online.org/article/view/SPP-2005-PA-10.