Intrinsic and extrinsic motivations: Classic definitions and new directions. Ryan, R. M. & Deci, E. L. Contemporary educational psychology, 25(1):54–67, 2000.
Intrinsic and extrinsic motivations: Classic definitions and new directions [link]Paper  bibtex   
@article{ryan_intrinsic_2000,
	title = {Intrinsic and extrinsic motivations: {Classic} definitions and new directions},
	volume = {25},
	shorttitle = {Intrinsic and extrinsic motivations},
	url = {http://www.sciencedirect.com/science/article/pii/S0361476X99910202},
	number = {1},
	urldate = {2013-12-30},
	journal = {Contemporary educational psychology},
	author = {Ryan, Richard M. and Deci, Edward L.},
	year = {2000},
	pages = {54--67},
}

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