Tishler, W. H. (2006). Door County's emerald treasure: A history of Peninsula State Park. University of Wisconsin Press.
Citace podle Chicago (17th ed.)Tishler, William H. Door County's Emerald Treasure: A History of Peninsula State Park. Madison: University of Wisconsin Press, 2006.
Citace podle MLA (9th ed.)Tishler, William H. Door County's Emerald Treasure: A History of Peninsula State Park. University of Wisconsin Press, 2006.
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