Cita APA (7a ed.)

Orr, E. L., & Orr, W. N. (2012). Oregon Geology: Sixth Edition (6th edition.). Oregon State University Press.

Cita Chicago Style (17a ed.)

Orr, Elizabeth L., y William N. Orr. Oregon Geology: Sixth Edition. 6th edition. Corvallis: Oregon State University Press, 2012.

Cita MLA (8a ed.)

Orr, Elizabeth L., y William N. Orr. Oregon Geology: Sixth Edition. 6th edition. Oregon State University Press, 2012.