and the Science of Love (G. T. Labs, 2007).
5
Edward L. Deci, «Effects of Externally Mediated Rewards on Intrinsic Motivation,» Journal of Personality and Social Psychology (1971). Vol. 18, p. 114.
6
Edward L. Deci, «Intrinsic Motivation, Extrinsic Reinforcement, and Inequity,» Journal of Personality and Social Psychology (1972). Vol. 22, p. 119–120.
7
«Important Notice: MSN Encarta to be Discontinued,» Microsoft press release (30 March 2009); Ina Fried, «Microsoft closing the book on Encarta,» CNET News (30 March 2009); «Microsoft to Shut Encarta as Free Sites Alter Market,» The Wall Street Journal (31 March 2009). Данные о Wikipedia см.: http://en.wikipedia.org/wiki/Wikipedia: About.