Rippelmeyer. The Civilian Conservation Corps in Southern Illinois, 1933-1942. Southern Illinois University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRippelmeyer. The Civilian Conservation Corps in Southern Illinois, 1933-1942. Southern Illinois University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRippelmeyer. The Civilian Conservation Corps in Southern Illinois, 1933-1942. Southern Illinois University Press.
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