MLA

Velde, Bruce D, and Andreas Bauer. Geochemistry At the Earth’s Surface. Springer Berlin Heidelberg, 2014.

APA

Velde, B. D, & Bauer, A. (2014). Geochemistry at the Earth’s Surface. Springer Berlin Heidelberg.

Chicago

Velde, Bruce D., and Andreas Bauer. Geochemistry At the Earth’s Surface. : Springer Berlin Heidelberg, 2014.