Parkes, J. F., & Mallett, C. J. (2011). Developing mental toughness: Attributional style retraining in rugby. The sport psychologist, 25(3), S. 269-287. doi:10.1123/tsp.25.3.269

Parkes, Jarred F., and Clifford J. Mallett. "Developing Mental Toughness: Attributional Style Retraining in Rugby." The Sport Psychologist 25, no. 3 (2011): S. 269-287.

Parkes, Jarred F., and Clifford J. Mallett. "Developing Mental Toughness: Attributional Style Retraining in Rugby." The Sport Psychologist 25.3 (2011): S. 269-287.