1. Friedman’s sleep apnea and snoring: surgical and non-surgical therapy Chap. 2 pg. 3
2. Ballenger’s textbook of Otolaryngology Chap. 98, pg. 1279–1282
3. Friedman’s sleep apnea And snoring: surgical and non-surgical therapy chap. 2 pg. 4,5,6,7.
4. Scott-Brown’s Otorhinolaryngology Head & Neck surgery; 8th edition, volume 3, Chap. 73
5. Cummings textbook of Otorhinolaryngology 7th edition, Chap. 15