Barbe, Walter B.A follow-up study of graduates of special classes for gifted children. Unpublished Ph. D. dissertation, Department of Education, Northwestern University, 1953, 105-148.
2.
Galagher, JamesJ. Teaching the GiftedChild. Boston: Allyn and Bacon, 1964.
3.
Hanna, Lavone A., et. al. Unit Teaching in the Elementary SchoolNew York: Holt, Reinhart and Winston, 1963.
4.
Michaelis, John V.Social Studies for Children in a Democracy. Englewood Cliffs, New Jersey: Prentice-Hall, Inc., 1963.
5.
Neff, Herbert B. "Educational Attitudes of High-ability, High-achieving Graduates of Ohio Secondary Schools." Unpublished master's thesis, Kent State University, Kent, Ohio, 1964, 108-113.
6.
Terman, Lewis M., and Oden, Melita H.Genetic Studies of Genius: the Gifted Child Grows Up. Stanford, California: Stanford University Press, 1947, 74-75.