Simmons, Colin H., author
Elsevier, 2009
Buku Referensi
Markus, John, 1911-, author
McGraw-Hill, 1980
Buku Referensi
edited by Douglas C. Greenwood
McGraw-Hill, 1959
Buku Referensi
Waddell, Joseph J., author
McGraw-Hill, 1985
Buku Referensi
Lawson, Joseph W.R., II, author
American Management Association, 1998
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