APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Whitten, D. G. A. The Penguin Dictionary of Geology. [Harmondsworth, Eng.]: Penguin Books, 1972.

MLA (9th ed.) Citation

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