Sumner, William Graham a Keller, Albert Galloway, ed. The challenge of facts and other essays. New Have: Yale University Press, 1914. xii, 450 stran.
Citace podle APASumner, W. G., & Keller, A. G. (1914). The challenge of facts and other essays. New Have : London: Yale University Press ; Humphrey Milford : Oxford University Press.
Styl ChicagoSumner, William Graham, and Albert Galloway Keller. The Challenge of Facts and Other Essays. New Have : London: Yale University Press ; Humphrey Milford : Oxford University Press, 1914.
Citace podle MLASumner, William Graham, and Albert Galloway Keller. The Challenge of Facts and Other Essays. New Have : London: Yale University Press ; Humphrey Milford : Oxford University Press, 1914.
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