Gregory, K. J. (1990). The earth's natural forces. Oxford University Press.
Chicago Style (17th ed.) CitationGregory, Kenneth J. The Earth's Natural Forces. New York: Oxford University Press, 1990.
MLA (9th ed.) CitationGregory, Kenneth J. The Earth's Natural Forces. Oxford University Press, 1990.
Warning: These citations may not always be 100% accurate.