1. “Report on Laryngectomy”;Cohen;Arch. Laryng.,1894
2. “Speech Rehabilitation after Total Removal of Larynx”;Levin;J. Amer. med. Ass.,1952
3. “The Rehabilitation of Patients Following Surgical Removal of the Larynx”;Mason;J Laryng.,1950
4. “Preliminary Voice Training for Laryngectomy”;McCall;Trans. Amer. laryng. rhin. otol. Soc.,1943