Blewett. Geology and Landscape of Michigan’s Pictured Rocks National Lakeshore and Vicinity. Wayne State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBlewett. Geology and Landscape of Michigan’s Pictured Rocks National Lakeshore and Vicinity. Wayne State University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBlewett. Geology and Landscape of Michigan’s Pictured Rocks National Lakeshore and Vicinity. Wayne State University Press.
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