edited by Joseph F. McCloskey, Florence N. Trefethen
John Hopkins Press, 1954
Buku Teks
Chorafas, Dimitris N.
Reinhold Publishing Corporation, 1958
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Dahl, Robert A., 1915-2014, author
Columbia University Press, 1960
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American Management Assosiation, Inc. (c.1958), 1958
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Elsevier, 1973
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