24 July 1974
References

Kalley, J.A.; Schoeman, E. & Andor, L.E. (eds)(1999). Southern African Political History: a chronology of key political events from independence to mid-1997, Westport: Greenwood.| Liebenberg, B.J. & Spies, S.B. (eds)(1993). South Africa in the 20th Century, Pretoria: Van Schaik Academic.