APA (7th ed.) Citation

Mittins, W. H. (1966). Key to a grammar of modern English. Methuen.

Chicago Style (17th ed.) Citation

Mittins, W. H. Key to a Grammar of Modern English. London: Methuen, 1966.

MLA (9th ed.) Citation

Mittins, W. H. Key to a Grammar of Modern English. Methuen, 1966.

Warning: These citations may not always be 100% accurate.