Egan, T. (2006). The worst hard time: The untold story of those who survived the great american dust bowl.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEgan, Timothy. The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust Bowl. 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEgan, Timothy. The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust Bowl. 2006.
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