Egan, T., & Lawlor, P. (2006). The worst hard time: The untold story of those who survived the great american dust bowl (Unabridged.). Tantor Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Egan, Timothy, و Patrick Lawlor. The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust Bowl. Unabridged. Old Saybrook: Tantor Audio, 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Egan, Timothy, و Patrick Lawlor. The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust Bowl. Unabridged. Tantor Audio, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.