APA
Gray L. H., . (1939). Foundations of language. New York: The Macmillan Company.
Chicago
Gray Louis H, . 1939. Foundations of language. New York: The Macmillan Company.
Harvard
Gray L. H., . (1939). Foundations of language. New York: The Macmillan Company.
MLA
Gray Louis H, . Foundations of language. New York: The Macmillan Company. 1939.
