Green, Robin J.; Feldman, Charles; Schoub, Barry D.; Richards, Guy A.; Madhi, Shabir A.; Zar, Heather J.; Lalloo, Umesh G.(Health and Medical Publishing Group, 2008-03)
Van Deventer, P.J.; Snyman, M.M.M. (Maria Magdalena Margaretha); Snyman, Retha(Department of Knowledge and Information Management, University of Johannesburg, 2004-03)