By Ryan R.M.   deci E.L.   in Contemporary Educational Psychology

ISSN:0361-476X|25|1|54-67

Academic Press‎(2000)‎

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By Nix G.A.   Ryan R.M.   Manly J.B.   deci E.L.   in Journal of Experimental Social Psychology

ISSN:0022-1031|35|3|266-284

Academic Press‎(1999)‎

Access to resources Favorite 7.6587534