1. Moore KL. The developing human: clinically oriented embryology. 4th ed. Toronto: W.B. Saunders; 1988. p 184-7
2. The thyroid;Hazard,1964
3. Dean HD. Carotid body tumors. In: Sabiston DC Jr, editor. Sabiston's textbook of surgery. 15th ed. Philadelphia: W.B. Saunders; 1997. p 1660
4. Congenital tumor of the base of the tongue, pressing down the epiglottis on the larynx and causing death by suffocation sixteen hours after birth;Hickmann;Trans Pathol Soc Lond,1869
5. Ectopic thyroid tissue;Larochelle;J Otolaryngol,1979