9RICHARD M RYAN,EDWARD L. DECI. Intrinsic and Extrinsic Motivations:Classic Definitions and New Directions[J]. Conemporary Edu Psychol, 2000,25:54-67.
10FREDERICK C M, RYAN R M.Differences in motivation for sport and exercise and their relations with participation and men tal health[J].J Sport Behavior, 1993,16 (3) : 124- 146.
