Ruhl, J. F. (1995). Water resources of the Grand Portage Indian Reservation, northeastern Minnesota. U.S. Geological Survey.
Chicago Style (17th ed.) CitationRuhl, J. F. Water Resources of the Grand Portage Indian Reservation, Northeastern Minnesota. Mounds View, Minnesota: U.S. Geological Survey, 1995.
MLA (9th ed.) CitationRuhl, J. F. Water Resources of the Grand Portage Indian Reservation, Northeastern Minnesota. U.S. Geological Survey, 1995.
Warning: These citations may not always be 100% accurate.