1. Patterns of academic achievement in hearing-impaired students: 1974 and 1983;Allen,1986
2. The Deaf School Child;Conrad,1979
3. Academic achievement test results of a national testing program for hearing-impaired students—United States: Spring 1971 (Series D, No. 9);DiFrancesca,1972
4. Peabody Picture Vocabulary Test;Dunn,1997
5. Linguistic deficiency and thinking. Research with deaf subjects, 1964–1969;Furth;Psychological Bulletin,1971