APA

Schiefelbusch R. L., Smith J. O. & Copeland R. H. (1967). Language and mental retardation, empirical and conceptual considerations. New York: Holt, Rinehart and Winston.

Chicago

Schiefelbusch Richard L, Smith James O and Copeland Ross H. 1967. Language and mental retardation, empirical and conceptual considerations. New York: Holt, Rinehart and Winston.

Harvard

Schiefelbusch R. L., Smith J. O. and Copeland R. H. (1967). Language and mental retardation, empirical and conceptual considerations. New York: Holt, Rinehart and Winston.

MLA

Schiefelbusch Richard L, Smith James O and Copeland Ross H. Language and mental retardation, empirical and conceptual considerations. New York: Holt, Rinehart and Winston. 1967.