Alexandris, K. & Carroll, B., Motives for recreational sport participation in Greece: Implications for planning and provision of sport services. European Physical Education Review, 3 .2 (1997): 129-143.
Ashford, B., Biddle, S. & Goudas, M., Participation in community sports centres, motives and predictors of enjoyment. Journal of Sport Sciences, 2 (1993):.249-256.
Atkinson, John W. Motivational Determinants of Risk-taking Behavior, (1958), pp. 322–339 in John W. Atkinson (editor), Motives in Fantasy, Action, and Society: A Method of Assessment and Study. Princeton, N.J.: Van Nostrand, (1957). First published in volume 64 of the Psychological Review