Marcus Abraham
Prentice-Hall, 1982
Buku Teks
Wagnes, Harvey M.
John Wiley & Sons Inc, 1962
Buku Teks
Muller, Max, author
Amacom, 2011
Buku Teks
Muller, Max author
[American Management Association, ], 2003
eBooks
Muller, Max, author
American Management Association, 2011
eBooks