1. World Health Organization (2011) Hepatitis B. Fact sheet no: 204. Available: http://www.who.int/mediacentre/factsheets/fs204/en. Accessed 2012 Dec 8.
2. Park JE, Park K (2007) Text Book of Preventive and Social Medicine, 19th Edition, M.S. Banarsidas Bhanot, Jabalpur 267.
3. Needle stick injuries during medical treatment.;S Deisenhammer;J. Hospital Infect,2009
4. Yayehyirad K, Asfaw D, Hailemariam K, Mengistu A, Binyam A et al.. (2009) Of Institutions and Persons. Ethio. J. Health Dev. 23 (especial issue) 173–223.
5. risk of HB (2013) Knowledge and attitude of medical science studentstoward hepatitis B and C infections;H Burnett;Int J Clin Exp Med,2005