Tohutoro APA (7th ed.)
Ojakangas, R. W., & Matsch, C. L. (1982). Minnesota's geology. University of Minnesota Press.
Tohutoru Kātū Chicago (17th ed.)
Ojakangas, Richard W., me Charles L. Matsch. Minnesota's Geology. Minneapolis: University of Minnesota Press, 1982.
Tohutoro MLA (9th ed.)
Ojakangas, Richard W., me Charles L. Matsch. Minnesota's Geology. University of Minnesota Press, 1982.
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