Marsh, PDV
Gower, 1974
Buku Teks
Abramowitz, Ava J., author
John Wiley & Sons, 2002
Buku Teks
Todd, Maria K.
CRC Press, Taylor & Francis Group, 2011
Buku Referensi
Lewicki, Roy J., author
Richard D. Irwin, 1985
Buku Teks
Tracy, Brian, author
American Management Association, 2013
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