Brookover and associates (1962, 1964, 1965) have investigated the nature of self-concept and its effects, and relationships, to the academic achievement. Results reported indicate that there is a direct relationship between self-concept and academic achievement.
Mangieri, J. N., & Olsen, H. D. (1976). Self Concept of Academic Ability and Reading Proficiency. Reading Horizons, 17 (1). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol17/iss1/6