Grobbelaar, Heinrich W.; Malan, Dawie D.J.; Steyn, B.J.M. (Barend Johannes Marthinus); Ellis, Suria M.(Africa Association for Health, Physical Education, Recreation, Sport and Dance, 2011-12)
Grobbelaar, Heinrich W.; Malan, Dawie D.J.; Steyn, B.J.M. (Barend Johannes Marthinus); Ellis, Suria M.(Southern African Alliance for Sport Science, Physical Education and Recreation, 2010)