APA (7th ed.) Citation

Dybwad, G. (1964). Challenges in mental retardation. Columbia University Press.

Chicago Style (17th ed.) Citation

Dybwad, Gunnar. Challenges in Mental Retardation. New York: Columbia University Press, 1964.

MLA (9th ed.) Citation

Dybwad, Gunnar. Challenges in Mental Retardation. Columbia University Press, 1964.