APA Edition Citation

Ahrens, L. H., Press, F., & Runcorn, S. K. (1956). Physics and chemistry of the earth. Pergamon [etc.].

Chicago Edition Citation

Ahrens, L. H., Frank Press, and S. K. Runcorn. Physics and Chemistry of the Earth. New York: Pergamon [etc.], 1956.

MLA Edition Citation

Ahrens, L. H., et al. Physics and Chemistry of the Earth. Pergamon [etc.], 1956.