Hoover Presidential Library Association & Hawley, E. W. (1981). Herbert Hoover as Secretary of Commerce: Studies in New Era thought and practice. University of Iowa Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hoover Presidential Library Association و Ellis W. Hawley. Herbert Hoover as Secretary of Commerce: Studies in New Era Thought and Practice. Iowa City, Iowa: University of Iowa Press, 1981.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Hoover Presidential Library Association و Ellis W. Hawley. Herbert Hoover as Secretary of Commerce: Studies in New Era Thought and Practice. University of Iowa Press, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.