Bishop, E. M. (2004). Hiking Oregon's geology (2nd ed.). Mountaineers Books.
Cita Chicago Style (17a ed.)Bishop, Ellen Morris. Hiking Oregon's Geology. 2nd ed. Seattle, WA: Mountaineers Books, 2004.
Cita MLA (8a ed.)Bishop, Ellen Morris. Hiking Oregon's Geology. 2nd ed. Mountaineers Books, 2004.
Precaución: Estas citas no son 100% exactas.