APA (7th ed.) Citation

(1990). A geologic time scale 1989 (1. publ.). Cambridge Univ. Press.

Chicago Style (17th ed.) Citation

A Geologic Time Scale 1989. 1. publ. Cambridge [u.a.]: Cambridge Univ. Press, 1990.

MLA (9th ed.) Citation

A Geologic Time Scale 1989. 1. publ. Cambridge Univ. Press, 1990.