Milton, N. M. (1989). Geomorphology, vegetation, and Patowmack Canal construction problems, Great Falls Park, Potomac River, Virginia: Potomac River Gorge, Virginia, July 13, 1989. American Geophysical Union.
Chicago-Zitierstil (17. Ausg.)Milton, N. M. Geomorphology, Vegetation, and Patowmack Canal Construction Problems, Great Falls Park, Potomac River, Virginia: Potomac River Gorge, Virginia, July 13, 1989. Washington, D.C: American Geophysical Union, 1989.
MLA-Zitierstil (9. Ausg.)Milton, N. M. Geomorphology, Vegetation, and Patowmack Canal Construction Problems, Great Falls Park, Potomac River, Virginia: Potomac River Gorge, Virginia, July 13, 1989. American Geophysical Union, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.