Flora, S. R., & Flora, D. B. (1999). Effects of extrinsic reinforcement for reading during childhood on reported reading habits of college students. The Psychological Record, 49, 3-14.
Effects of the "Book It!" reading program and parental pay for reading.
171 college students were surveyed about the amount they read per week, their intrinsic interest in reading.
Increased the amount read, enjoyment of reading, and helped learn to read.