Style de citation APA (7e éd.)

Harland, W. B. (1989). A geologic time scale 1989. Cambridge University Press.

Style de citation Chicago (17e éd.)

Harland, Walter Brian. A Geologic Time Scale 1989. New York: Cambridge University Press, 1989.

Style de citation MLA (9e éd.)

Harland, Walter Brian. A Geologic Time Scale 1989. Cambridge University Press, 1989.