Keller, A. G., & Sumner, W. G. 1. T. s. o. s. (1932). Man's rough road; backgrounds and bearings from mankind's experience. Frederick A. Stokes.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeller, Albert Galloway, और William Graham 1840-1910. The science of society Sumner. Man's Rough Road; Backgrounds and Bearings from Mankind's Experience. New York: Frederick A. Stokes, 1932.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKeller, Albert Galloway, और William Graham 1840-1910. The science of society Sumner. Man's Rough Road; Backgrounds and Bearings from Mankind's Experience. Frederick A. Stokes, 1932.
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