APA

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

Chicago

Smith Robert McNeil, . 1971. An introduction to mental retardation. New York: McGraw-Hill.

Harvard

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

MLA

Smith Robert McNeil, . An introduction to mental retardation. New York: McGraw-Hill. 1971.