APA (7th ed.) Citation

Huggett, R. J. (1990). Catastrophism: Systems of earth history. E. Arnold.

Chicago Style (17th ed.) Citation

Huggett, Richard J. Catastrophism: Systems of Earth History. London ; New York: E. Arnold, 1990.

MLA (8th ed.) Citation

Huggett, Richard J. Catastrophism: Systems of Earth History. E. Arnold, 1990.