Shurter, Robert L.
McGraw-Hill, 1957
Buku Teks
Murphy, Herta A., author
McGraw-Hill , 1984
Buku Teks
Murphy, Herta A., author
McGraw-Hill, 1976
Buku Teks
Treece, Malra, author
Allyn and Bacon, 1989
Buku Teks
Sant, Tom, author
American Management Association, 2012
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