@book{Williams2000,
author = {Williams, B. and Gilgen, D. and Campbell, C. and Taljaard, D. and MacPhail, C.},
title= {The natural history of HIV / AIDS in South Africa: A biomedical and social survey in Carletonville},
year = {2000},
address = {Johannesburg},
publisher = {Council for Scientific and Industrial Research},
}