1. Patterns of academic achievement among hearing impaired students: 1974 and 1983;Allen,1986
2. The Deaf School Child: Language and Cognitive Function;Conrad,1979
3. S. DiFrancesca, Academic Achievement Test Results of a National Testing Program for Hearing Impaired Students: United States, Spring 1971, Report No. 9, Series D, Gallaudet College, Office of Demographic Studies, Washington, DC, 1972.
4. Reading achievement of the deaf: another look;Lane;Volta Rev.,1974
5. The reading achievements of a group of severely and profoundly hearing-impaired school leavers educated within a natural aural approach;Lewis;J. Br. Assoc. Teach. Deaf,1996