1. Krug EG, Dahlberg LL, Mercy JA, Zwi AB, Lozano R 2002.World Report on Violence and Health. Geneva: World Health Organization.
2. Shisana 0, Rehle T, Simbayi L, Parker W, Bhana A, Zuma K 2005.South African National HIV Prevalence, Incidence, Behaviour and Communication Survey. Cape Town: Human Sciences Research Council Press.
3. Wechsberg WM 2005.The Pretoria women’s health co-op study.South African Community Epidemiology Network on Drug Use (SACENDU): Monitoring Alcohol and Drug Trends. Tygerberg, South Africa: Medical Research Council.
4. Zuckerman M 1994.Behavioral Expressions and Biological Bases of Sensation Seeking. New York: Oxford University Press.