Briggs, Mark, author
Sage, 2012
Buku Teks
Sheldon, K.Scott, author
John Wiley & Sons, 2000
Buku Teks
Donovan, Frank R., author
Thomas Y. Crowell, 1968
Buku Teks
Kelly, Matthew
Ballantine Books, 2008
Buku Teks
Osit, Michael, author
American Management Association, 2008
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