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Ryan, Richard M.; Deci, Edward L. (2000). "Intrinsic and Extrinsic Motivations: Classic Definitions and New Directions". Contemporary Educational Psychology25 (1): 54–67. doi:10.1006/ceps.1999.1020. பப்மெட்:10620381.
Ryan, Richard M.; Deci, Edward L. (2000). "Intrinsic and Extrinsic Motivations: Classic Definitions and New Directions". Contemporary Educational Psychology25 (1): 54–67. doi:10.1006/ceps.1999.1020. பப்மெட்:10620381.
worldcat.org
Jodai, Hojat; Zafarghandi, Amir Mahda Vi; Tous, Maryam Danaye (2013-01-01). "Motivation, Integrativeness, Organizational Influence, Anxiety, and English Achievement" (in en). Glottotheory4 (2). doi:10.1524/glot.2013.0012. பன்னாட்டுத் தர தொடர் எண்:2196-6907.