Cita APA (7th ed.)

Allen, R. L. (1972). English grammars and english grammar. Charles Scribner.

Cita Chicago (17th ed.)

Allen, Robert L. English Grammars and English Grammar. Nueva York: Charles Scribner, 1972.

Cita MLA (9th ed.)

Allen, Robert L. English Grammars and English Grammar. Charles Scribner, 1972.