Predicting long-term growth in adolescents’ mathematics achievement: The unique contributions of motivation and cognitive strategies.

Murayama, K., Pekrun, R., Lichtenfeld, S., & vom Hofe, R. (2013). Predicting long-term growth in adolescents' mathematics achievement: The unique contributions of motivation and cognitive strategies. Child Development, 84(4), 1475-1490. PDF   Online Article