Alderman, R. B., Psychological Behaviour in Sport, Philadelphia (1974)
Alderman R. B., Strategies for motivating young athletes. In W.F. Straub (ed.) Sport Psychology: An analysis of athletic behaviour. New York, Movement Publications (1978)
Atkinson, J. W., Motivational determinants of risk-taking behavior. Psychological Review, 64 (1957): 359–372.