Edwards, David John; Steyn, B.J.M. (Barend Johannes Marthinus); Buscombe, Richard M.; Edwards, Stephen D.; Denyer, Philip(Southern African Alliance for Sport Science, Physical Education and Recreation, 2014)
Edwards, David John; Steyn, B.J.M. (Barend Johannes Marthinus)(Africa Association for Health, Physical Education, Recreation, Sport and Dance, 2011-09)