APA (7th ed.) Citation

Gregory, K. J. (1990). The earth's natural forces. Oxford University Press.

Chicago Style (17th ed.) Citation

Gregory, Kenneth J. The Earth's Natural Forces. New York: Oxford University Press, 1990.

MLA (9th ed.) Citation

Gregory, Kenneth J. The Earth's Natural Forces. Oxford University Press, 1990.

Warning: These citations may not always be 100% accurate.