Grout, F. F. (1926). The Geology and magnetite deposits of Northern St. Louis County, Minnesota. University of Minnesota Press.
Chicago-Zitierstil (17. Ausg.)Grout, Frank F. The Geology and Magnetite Deposits of Northern St. Louis County, Minnesota. Minneapolis: University of Minnesota Press, 1926.
MLA-Zitierstil (9. Ausg.)Grout, Frank F. The Geology and Magnetite Deposits of Northern St. Louis County, Minnesota. University of Minnesota Press, 1926.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.