Irving R. D. Roland Duer & Van Hise Ch. R. Charles Richard. (1892). The Penokee iron-bearing series of Michigan and Wisconsin. Washington, Governmext Printing Office, 1892.
Style de citation Chicago (17e éd.)Irving R. D. Roland Duer et Van Hise Ch. R. Charles Richard. The Penokee Iron-bearing Series of Michigan and Wisconsin. Washington, Governmext Printing Office, 1892, 1892.
Style de citation MLA (9e éd.)Irving R. D. Roland Duer et Van Hise Ch. R. Charles Richard. The Penokee Iron-bearing Series of Michigan and Wisconsin. Washington, Governmext Printing Office, 1892, 1892.
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