APA (7th ed.) Citation

Empson, W. (1973). Seven types of ambiguity. Penguin Books.

Chicago Style (17th ed.) Citation

Empson, William. Seven Types of Ambiguity. Harmondsworth: Penguin Books, 1973.

MLA (9th ed.) Citation

Empson, William. Seven Types of Ambiguity. Penguin Books, 1973.