Choi, Whan Bong (1996) The effect of extrinsic reward on sport performance, perceived competence and intrinsic motivation. PhD thesis, Victoria University of Technology.

Morris, Tony and Choi, Whan Bong (1993) Development of the intrinsic motivation inventory for use with Australian children and adolescents. In: Sport psychology: an integrated approach. Serpa, Sidonio, Alves, Jose, Ferreira, Vitor and Paula-Brito, Antonio, eds. International Society of Sport Psychology, Lisbon, Portugal, pp. 476-480.

Morris, Tony and Choi, Whan Bong (1993) Test of a causal model relating extrinsic reward, performance, perceived competence and intrinsic motivation for basketball free throw shooting. In: Sport psychology: an integrated approach. Serpa, Sidonio, Alves, Jose, Ferreira, Vitor and Paula-Brito, Antonio, eds. International Society of Sport Psychology, Lisbon, Portugal, pp. 480-483.

Morris, Tony and Choi, Whan Bong (1993) The effect of extrinsic rewards on performance, perceived competence and intrinsic motivation in basketball shooting. In: Sport psychology: an integrated approach. Serpa, Sidonio, Alves, Jose, Ferreira, Vitor and Paula-Brito, Antonio, eds. International Society of Sport Psychology, Lisbon, Portugal, pp. 868-872.