1. Farthing CF, Brown SE, Straughton RCD. A colour atlas of AIDS and HIV disease. Arizona: Wolfe Medical Publications; 1988.
2. O’ Donnell M. HIV/AIDS: loss, grief, challenge and hope. Florida: Taylor & Francis; 1996.
3. Sepkowitz KA. AIDS- the first 20 years. N Engl J Med. 2001;344(23):1764–72.
4. Russell C. Textbook of medicine. Philadelphia: Saunders; 1998. p. 1523–799.
5. WHO. HIV/AIDS. 2010. Available at: http://www.who.int/topics/hiv_aids/en/ . (Last accessed on 9 July 2010).