1.
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Cambridge, MA : Harvard University Press, 1968.
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2.
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Washington, D.C. : AEI Press ; Blue Ridge Summit, Pa. : Distributed to the trade by National Book Network, c2010.
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3.
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New York, Free Press [1965, c1960]
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4.
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New York : Free Press Paperback, 1997.
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5.
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New York : Basic Books, c1989.
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6.
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Washington, D.C. : AEI Press, 1998.
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7.
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New York : PublicAffairs, c2008.
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