APA-referens (7:e uppl.)
Blewett, W. L. (2012). Geology and landscape of Michigan's Pictured Rocks National Lakeshore and vicinity. Wayne State University Press.
Chicago-referens (17:e uppl.)
Blewett, William L. Geology and Landscape of Michigan's Pictured Rocks National Lakeshore and Vicinity. Detroit: Wayne State University Press, 2012.
MLA-referens (9:e uppl.)
Blewett, William L. Geology and Landscape of Michigan's Pictured Rocks National Lakeshore and Vicinity. Wayne State University Press, 2012.
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