APA (7th ed.) Citation

Evans, I. O. (1949). The observer's book of British geology. F. Warne.

Chicago Style (17th ed.) Citation

Evans, I. O. The Observer's Book of British Geology. London, New York: F. Warne, 1949.

MLA (8th ed.) Citation

Evans, I. O. The Observer's Book of British Geology. F. Warne, 1949.