APA (7th ed.) Citation

Heber, R. F. (1961). A manual on terminology and classification in mental retardation. The American Association on Mental Deficiency.

Chicago Style (17th ed.) Citation

Heber, Rick F. A Manual on Terminology and Classification in Mental Retardation. [Springfiled, Ill.]: The American Association on Mental Deficiency, 1961.

MLA (9th ed.) Citation

Heber, Rick F. A Manual on Terminology and Classification in Mental Retardation. The American Association on Mental Deficiency, 1961.