Pearson, Barrie, author
Mercurry, 1991
Buku Teks
Carr, Albert Z., author
New American Library, 1968
Buku Teks
Rogers, David J., author
Charles Schribder's Sons, 1987
Buku Teks
Prerau, Sydney, author
McGraw-Hill, 1960
Buku Teks
Drucker, Peter Ferdinand, 1909-2005, author
Harvard Business Review Book, 2008
Buku Teks