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![Cover for Theta H. Wolf · The Effect of Praise and Competition: On the Persisting Behavior of Kindergarten Children (Innbunden bok) [New ed of 1938 edition] (1975)](https://imusic.b-cdn.net/images/item/original/990/9780837158990.jpg?theta-h-wolf-1975-the-effect-of-praise-and-competition-on-the-persisting-behavior-of-kindergarten-children-innbunden-bok&class=scaled&v=1524436406)