United States Geological Survey. (1966). Topographic instructions of the United States Geological Survey. United States Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)United States Geological Survey. Topographic Instructions of the United States Geological Survey. Washington, D.C: United States Gov. Print. Off, 1966.
MLA-Zitierstil (9. Ausg.)United States Geological Survey. Topographic Instructions of the United States Geological Survey. United States Gov. Print. Off, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.