APA (7th ed.) Citation

Orr, E. L. (2012). Oregon geology (6. ed.). Oregon State Univ. Press.

Chicago Style (17th ed.) Citation

Orr, Elizabeth L. Oregon Geology. 6. ed. Corvallis: Oregon State Univ. Press, 2012.

MLA (9th ed.) Citation

Orr, Elizabeth L. Oregon Geology. 6. ed. Oregon State Univ. Press, 2012.