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)
Trimble, Morgan Jayne; Van Aarde, Rudi J.; Ferreira, Sam M.; Norgaard, Camilla F.; Fourie, Jo; Lee, Phyllis C.; Moss, Cynthia J.(Public Library of Science, 2011-10-19)