APA (7th ed.) Citation

ScienceDirect (Online service) & Gradstein, F. M. (2012). The Geologic time scale 2012. Elsevier.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service) and F. M. Gradstein. The Geologic Time Scale 2012. [Oxford, U.K.]: Elsevier, 2012.

MLA (9th ed.) Citation

ScienceDirect (Online service) and F. M. Gradstein. The Geologic Time Scale 2012. Elsevier, 2012.

Warning: These citations may not always be 100% accurate.