(1976). Map showing outstanding natural and historic landmarks in the greater Denver area, Front Range urban corridor, Colorado. U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Map Showing Outstanding Natural and Historic Landmarks in the Greater Denver Area, Front Range Urban Corridor, Colorado. Reston, Va: U.S. Geological Survey, 1976.
MLA-Zitierstil (9. Ausg.)Map Showing Outstanding Natural and Historic Landmarks in the Greater Denver Area, Front Range Urban Corridor, Colorado. U.S. Geological Survey, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.