Meyer, Harold E., author
Prentice-Hall, 1992
Buku Referensi
Poe, Roy W., author
McGraw-Hill, 1994
Buku Referensi
Poe, Roy W., author
McGraw-Hill, 2006
Buku Teks
Poe, Roy W., author
McGraw-Hill, 1988
Buku Teks
Wilson, Kevin, author
American Management Association, 2010
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