APA (7th ed.) Citation

Harland, W. B. (1982). A Geologic time scale. Cambridge University Press.

Chicago Style (17th ed.) Citation

Harland, W. B. A Geologic Time Scale. Cambridge [England]: Cambridge University Press, 1982.

MLA (9th ed.) Citation

Harland, W. B. A Geologic Time Scale. Cambridge University Press, 1982.