(1989). Geology of Grand Canyon, Northern Arizona (with Colorado river guides): Lees Ferry to Pierce Ferry, Arizona. American Geophysical Union.
Chicago-Zitierstil (17. Ausg.)Geology of Grand Canyon, Northern Arizona (with Colorado River Guides): Lees Ferry to Pierce Ferry, Arizona. Washington, DC: American Geophysical Union, 1989.
MLA-Zitierstil (9. Ausg.)Geology of Grand Canyon, Northern Arizona (with Colorado River Guides): Lees Ferry to Pierce Ferry, Arizona. American Geophysical Union, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.