APA (7th ed.) Citation

Smith, R. M. (1971). An introduction to mental retardation. McGraw-Hill.

Chicago Style (17th ed.) Citation

Smith, Robert McNeil. An Introduction to Mental Retardation. New York: McGraw-Hill, 1971.

MLA (9th ed.) Citation

Smith, Robert McNeil. An Introduction to Mental Retardation. McGraw-Hill, 1971.