Deci, Edward L. & Ryan, Richard M.: The “What” and “Why” of Goal Pursuits: Human Needs and the Self-Determination of Behavior. Psychological Inquiry, 2000, nro Vol. 11, No. 4, s. 227–268. Lawrence Erlbaum Associates, Inc. Artikkelin verkkoversio. (pdf) Viitattu 4.1.2014. (englanniksi) (Arkistoitu – Internet Archive)
web.archive.org
Deci, Edward L. & Ryan, Richard M.: The “What” and “Why” of Goal Pursuits: Human Needs and the Self-Determination of Behavior. Psychological Inquiry, 2000, nro Vol. 11, No. 4, s. 227–268. Lawrence Erlbaum Associates, Inc. Artikkelin verkkoversio. (pdf) Viitattu 4.1.2014. (englanniksi) (Arkistoitu – Internet Archive)