Forsyth, Patrick, author
Grolier International, 1999
Buku Teks
Forsyth, Patrick, author
Groulier, 1998
Buku Teks
Harvard Business School Press, 2004
Buku Teks
Lakos, Amos, author
Westview Press, 1989
Buku Referensi
Luecke, Richard, author
[American Management Association;, ], 2010
eBooks