Blumenthal, J. C. (1962). English 3200: A programmed course in grammar and usage. Harcourt, Brace & World.
Lua i Stíl Chicago (17ú heag.)Blumenthal, Joseph C. English 3200: A Programmed Course in Grammar and Usage. New York: Harcourt, Brace & World, 1962.
Lua MLA (9ú heag.)Blumenthal, Joseph C. English 3200: A Programmed Course in Grammar and Usage. Harcourt, Brace & World, 1962.
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