Cita APA (7a ed.)

Orr, E. L., & Orr, W. N. (2009). Oregon Fossils, Second Edition (2nd ed.). Oregon State University Press.

Cita Chicago Style (17a ed.)

Orr, Elizabeth L., y William N. Orr. Oregon Fossils, Second Edition. 2nd ed. Corvallis, OR: Oregon State University Press, 2009.

Cita MLA (8a ed.)

Orr, Elizabeth L., y William N. Orr. Oregon Fossils, Second Edition. 2nd ed. Oregon State University Press, 2009.