Rippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
Čikaški stil citiranja (17. izdanje)Rippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
MLA način citiranja (8. izdanje)Rippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
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