APA (7th ed.) Citation

ScienceDirect (Online service), Roberts, D. G., & Bally, A. W. (2012). Regional geology and tectonics. Elsevier.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), D. G. Roberts, and A. W. Bally. Regional Geology and Tectonics. Oxford: Elsevier, 2012.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Regional Geology and Tectonics. Elsevier, 2012.