Remley, Jim, author
American Management Association, 2005
eBooks
Keller, Gary, author
McGraw-Hill, 2010
Buku Teks
McCrea, Bridget, author
[American Management Association, ], 2005
eBooks
Randel, Jim, author
Facts on File Publications, 1986
Buku Teks
Kau, James B., author
McGraw-Hill, 1985
Buku Teks