APA (7th ed.) Citation

Whitten, D. (1972). The Penguin dictionary of geology. Penguin Books.

Chicago Style (17th ed.) Citation

Whitten, D.G.A. The Penguin Dictionary of Geology. London: Penguin Books, 1972.

MLA (8th ed.) Citation

Whitten, D.G.A. The Penguin Dictionary of Geology. Penguin Books, 1972.