Nawa, N., B. Danny, B. Anthorny, and M. K. Davy. “An Assessment of Factors Influencing Science teachers’ Use of Practical Lessons in Public Secondary Schools of Kabwe District - Zambia”. International Journal of Science and Engineering Invention, vol. 6, no. 06, Sept. 2019, p. 136 to 142, http://ijsei.in/index.php/ijsei/article/view/181.