1. Ferguson, D. G. Review of literature on the slow learner. Education, 81, 326–330.
2. Education of the slow-learning child;Ingram,1960
3. Education of the slow learners;Johnson,1963
4. A proper setting for learning;Rosenburger;Bulletin of the National Association of Secondary School Principals,1954
5. Teaching the slow learning child;Smith,1954