Lua APA (7ú heag.)
Ojakangas, R. W., & Matsch, C. L. (1982). Minnesota's geology. University of Minnesota Press.
Lua i Stíl Chicago (17ú heag.)
Ojakangas, Richard W., agus Charles L. Matsch. Minnesota's Geology. Minneapolis: University of Minnesota Press, 1982.
Lua MLA (9ú heag.)
Ojakangas, Richard W., agus Charles L. Matsch. Minnesota's Geology. University of Minnesota Press, 1982.
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