S. B, Aderonmu Temitope, and Adolphus Telima. “Problems Militating Against the Effective Teaching of Gravitational Force: A Study of Secondary School Physics Teachers in Cross River State, Nigeria”. International Journal of Asian Social Science 7, no. 1 (July 1, 2012): 1012–1017. Accessed November 22, 2024. https://archive.aessweb.com/index.php/5007/article/view/2280.