Intrinsic and extrinsic motivation
Sansone Carol, Harackiewicz Judith M.Kniha
Citace v seznamu literatury:
SANSONE, Carol a HARACKIEWICZ, Judith M. (ed.). Intrinsic and extrinsic motivation: the search for optimal motivation and performance. Educational psychology series. San Diego: Academic Press, c2000. ISBN 0126190704. Dostupné také z: http://www.loc.gov/catdir/description/els031/00102571.html.