(1992). Grand Canyon National Park, Arizona: Featuring: eight 15' quads including the Bright Angel Corridor area, backcountry guide with use areas, highlighted hiking trails, trip planner, up-to-date regulations (Rev.). Trails Ill.
Chicago-Zitierstil (17. Ausg.)Grand Canyon National Park, Arizona: Featuring: Eight 15' Quads Including the Bright Angel Corridor Area, Backcountry Guide with Use Areas, Highlighted Hiking Trails, Trip Planner, Up-to-date Regulations. Rev. Evergreen, Colo: Trails Ill, 1992.
MLA-Zitierstil (9. Ausg.)Grand Canyon National Park, Arizona: Featuring: Eight 15' Quads Including the Bright Angel Corridor Area, Backcountry Guide with Use Areas, Highlighted Hiking Trails, Trip Planner, Up-to-date Regulations. Rev. Trails Ill, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.