APA (7th ed.) Zitazioa
Gray, L. H. (1950). Foundations of language (Second printing.). Macmillan.
Chicago Style (17th ed.) Zitazioa
Gray, Louis H. Foundations of Language. Second printing. New York: Macmillan, 1950.
MLA (9th ed.) Zitazioa
Gray, Louis H. Foundations of Language. Second printing. Macmillan, 1950.
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