Muhammad Akram Shah, Maryam Hussain, and Sabad Gul. “Development of A Model For the in-Service Training of Secondary School Science Teachers”. PERENNIAL JOURNAL OF HISTORY 3, no. 1 (May 27, 2022): 49-68. Accessed September 29, 2022. http://pjh.wum.edu.pk/index.php/ojs/article/view/100.