Armstrong, A. K. (1970). Mississippian rugose corals, peratrovich formation West Coast, Prince of Wales Island, Southeastern Alaska. U.S. Government Printing Office.
Citace podle Chicago (17th ed.)Armstrong, Augustus K. Mississippian Rugose Corals, Peratrovich Formation West Coast, Prince of Wales Island, Southeastern Alaska. Washington, D.C: U.S. Government Printing Office, 1970.
Citace podle MLA (9th ed.)Armstrong, Augustus K. Mississippian Rugose Corals, Peratrovich Formation West Coast, Prince of Wales Island, Southeastern Alaska. U.S. Government Printing Office, 1970.
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