Ullah, Hidayat, et al. “GAGNÉ’S 9 EVENTS OF INSTRUCTION - A TIME TESTED WAY TO IMPROVE TEACHING: Gagné’s 9 Events of Instruction”. Pakistan Armed Forces Medical Journal, vol. 65, no. 4, Aug. 2015, pp. 535-9, https://pafmj.org/PAFMJ/article/view/1009.