Edmondson, Jerold A.; John H. Esling (2005). "The valves of the throat and their functioning in tone, vocal register, and stress: laryngoscopic case studies". Phonology. 23 (2). Cambridge University Press: 157–191. doi:10.1017/S095267570600087X. S2CID62531440.
Edmondson, Jerold A.; John H. Esling (2005). "The valves of the throat and their functioning in tone, vocal register, and stress: laryngoscopic case studies". Phonology. 23 (2). Cambridge University Press: 157–191. doi:10.1017/S095267570600087X. S2CID62531440.