Raza, Col Syed Nusrat, et al. “COMPARISON OF LOCALLY MADE PHONATING DEVICE VERSUS OESOPHAGEAL SPEECH IN POSTLARYNGECTOMY SPEECH REHABILITATION: Locally Made Phonating Device for Speech Rehabilitation”. Pakistan Armed Forces Medical Journal, vol. 60, no. 2, June 2010, pp. 241-6, https://pafmj.org/PAFMJ/article/view/798.