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Чикаго-гийн эшлэл (17 дахь хэвлэлт)ebrary, Inc, Carol Sansone, ба Judith M. Harackiewicz. Intrinsic and Extrinsic Motivation: The Search for Optimal Motivation and Performance. San Diego: Academic Press, 2000.
MLA -ийн эшлэл (9 дэх хэвлэлт)ebrary, Inc, et al. Intrinsic and Extrinsic Motivation: The Search for Optimal Motivation and Performance. Academic Press, 2000.
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