ebrary, Inc, Sansone, C., & Harackiewicz, J. M. (2000). Intrinsic and extrinsic motivation: The search for optimal motivation and performance. Academic Press.
Chicago-viite (17. p.)ebrary, Inc, Carol Sansone, ja Judith M. Harackiewicz. Intrinsic and Extrinsic Motivation: The Search for Optimal Motivation and Performance. San Diego: Academic Press, 2000.
MLA-viite (9. p.)ebrary, Inc, et al. Intrinsic and Extrinsic Motivation: The Search for Optimal Motivation and Performance. Academic Press, 2000.
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