Cita APA (7th ed.)

Greenbaum, S. (1996). An introduction to English grammar. Longman.

Cita Chicago (17th ed.)

Greenbaum, Sidney. An Introduction to English Grammar. Harlow, Essex, Eng: Longman, 1996.

Cita MLA (9th ed.)

Greenbaum, Sidney. An Introduction to English Grammar. Longman, 1996.