Koay, C. B.; Herdman, R. C. D. (1995). "Nasendoscopy guided removal of fish bones from the base of tongue and the vallecula". The Journal of Laryngology & Otology. 109 (6). Cambridge University Press: 534–535. doi:10.1017/S0022215100130634. PMID7642995. S2CID21262976.
Koay, C. B.; Herdman, R. C. D. (1995). "Nasendoscopy guided removal of fish bones from the base of tongue and the vallecula". The Journal of Laryngology & Otology. 109 (6). Cambridge University Press: 534–535. doi:10.1017/S0022215100130634. PMID7642995. S2CID21262976.
Koay, C. B.; Herdman, R. C. D. (1995). "Nasendoscopy guided removal of fish bones from the base of tongue and the vallecula". The Journal of Laryngology & Otology. 109 (6). Cambridge University Press: 534–535. doi:10.1017/S0022215100130634. PMID7642995. S2CID21262976.