1.
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New York : Macmillan Co., 1915 (Norwood, Mass. : J.S. Cushing Co.)
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2.
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Urbana : University of Illinois Press, c2003.
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3.
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Philadelphia : American Academy of Political and Social Science, 1914.
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4.
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London : Continuum International, 2005.
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5.
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Boston ; New York : Houghton Mifflin Co., 1913 (Cambridge, Mass. : Riverside Press)
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6.
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7.
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Freeport, N.Y., Books for Libraries Press [1970]
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8.
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Philadelphia : American Academy of Political and Social Science, 1899.
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9.
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New York : The Macmillan Company, 1916.
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10.
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Urbana : University of Illinois Press, 2002.
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