O'Neil, John Wesley; Steyn, B.J.M. (Barend Johannes Marthinus)(Southern African Alliance for Sport Science, Physical Education and Recreation, 2007)
Tao, Karina F.M.; Moreira, Tais de C.; Jayakody, Dona M.P.; Swanepoel, De Wet; Brennan-Jones, Christopher G.; Coetzeea, Lize; Eikelboom, Robert H.(Taylor and Francis, 2021)