Cita APA (7th ed.)

BLUMENTHAL, J. C. (1973). English 2600: A programed course in grammar and usage.-- Ed. 4. Harcourt Brace Jovanovich.

Cita Chicago (17th ed.)

BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. New York: Harcourt Brace Jovanovich, 1973.

Cita MLA (9th ed.)

BLUMENTHAL, Joseph C. English 2600: A Programed Course in Grammar and Usage.-- Ed. 4. Harcourt Brace Jovanovich, 1973.