APA (7th ed.) Citation

Gale Group, Selley, R. C., Cocks, L. R. M., & Plimer, I. R. (2005). Encyclopedia of geology. Elsevier.

Chicago Style (17th ed.) Citation

Gale Group, Richard C. Selley, L. R. M. Cocks, and I. R. Plimer. Encyclopedia of Geology. Amsterdam, Netherlands: Elsevier, 2005.

MLA (9th ed.) Citation

Gale Group, et al. Encyclopedia of Geology. Elsevier, 2005.