APA (7th ed.) Citation

Barron, E. J. (1996). Climatic variation in earth history. University Science Books.

Chicago Style (17th ed.) Citation

Barron, Eric J. Climatic Variation in Earth History. Sausalito, Calif.: University Science Books, 1996.

MLA (9th ed.) Citation

Barron, Eric J. Climatic Variation in Earth History. University Science Books, 1996.