S. B AT, Telima A. Problems Militating Against the Effective Teaching of Gravitational Force: A Study of Secondary School Physics Teachers in Cross River State, Nigeria. 5007 [Internet]. 2012 Jul. 1 [cited 2025 May 14];7(1):1012-7. Available from: https://www.archive.aessweb.com/index.php/5007/article/view/2280