Khan, Aslam, et al. “A REVIEW OF ENDOBRONCHIAL ULTRASOUND GUIDED TRANSBRONCHIAL NEEDLE ASPIRATE (EBUS-TBNA): EBUS-TBNA”. Pakistan Armed Forces Medical Journal, vol. 65, no. 4, Aug. 2015, pp. 557-63, https://pafmj.org/PAFMJ/article/view/1045.