Livingston, Robert T.
New York, N.Y. Columbia Univ. Press 1957,
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Anthony, Robert N. (Robert Newton), 1916-2006, author
Harvard University, 1952
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Chorafas, Dimitris N.
Reinhold Publishing Corporation, 1958
Buku Teks
Artikel Jurnal
American Management Assosiation, Inc. (c.1958), 1958
Buku Teks