Zeeshan, Mansoor, and Waqar Ahmed. “SMOKING AMONG DOCTORS OF MILITARY HOSPITAL RAWALPINDI; FREQUENCY, HABITS AND ATTITUDES: Smoking Among Doctors”. Pakistan Armed Forces Medical Journal, vol. 59, no. 4, Dec. 2009, pp. 437-9, https://www.pafmj.org/PAFMJ/article/view/1748.