Kohn, A. (1993). Punished by rewards: The trouble with gold stars, incentive plans, A's, praise and other bribes (3. [print.].). Houghton Mifflin.
Chicago-Zitierstil (17. Ausg.)Kohn, Alfie. Punished by Rewards: The Trouble with Gold Stars, Incentive Plans, A's, Praise and Other Bribes. 3. [print.]. Boston, Mass. u.a: Houghton Mifflin, 1993.
MLA-Zitierstil (9. Ausg.)Kohn, Alfie. Punished by Rewards: The Trouble with Gold Stars, Incentive Plans, A's, Praise and Other Bribes. 3. [print.]. Houghton Mifflin, 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.