APA (7th ed.) Citation

(1989). International Directory of Mental Retardation Resources (3., ed.). U. S. Department of Health and Human Services.

Chicago Style (17th ed.) Citation

International Directory of Mental Retardation Resources. 3., ed. Washington: U. S. Department of Health and Human Services, 1989.

MLA (9th ed.) Citation

International Directory of Mental Retardation Resources. 3., ed. U. S. Department of Health and Human Services, 1989.