APA (7th ed.) Citation

Greenbaum. (1990). A student's grammar of the English language. Longman.

Chicago Style (17th ed.) Citation

Greenbaum. A Student's Grammar of the English Language. Harlow: Longman, 1990.

MLA (8th ed.) Citation

Greenbaum. A Student's Grammar of the English Language. Longman, 1990.