1. [1] Pradhan S. Voice conservative surgery in laryngeal cancer. 1st edn. Lloyds Publishing House, 1997:pp 1.
2. [2] Kerr AG, Hibbert J. Scott Brown's otolaryngology. 6th edn. Butterworth-Heinemann, 1997;5:1-25.
3. [3] Gerald M. Otolaryngology. Revised edn. LippincotRaven, 1996;3:1-25.
4. [4] Batra K, Motwani G, Sagar PC. Functional voice disorders and their occurrence in 100 patients of hoarseness as seen on fibre-optic laryngoscopy. Indian J Otolaryngol Head Neck Surg 2004;56(2):91-5.
5. Hoarseness;CG;Medical Clinics of North America,1999