1. Scott Brown's Otolaryngology;McCormick,1996
2. World Health Organization Fact sheet. Deafness and hearing impairment 2014 http://www.who.int/mediacentre/factsheets/fs300/en/index.html
3. World Health Organization State of hearing and ear care in the South East Asia Region 2012 http://www.searo.who.int/LinkFiles/Publications_HEARING_&_EAR_CARE.pdf
4. Correlation between hearing loss and risk indicators in a neonatal hearing screening reference service;Barboza;ACR.,2013
5. Motor skill deficits in children with partial hearing;Livingstone;Dev. Med. Child Neurol.,2011