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