Stryker, Perrin
Harper & Row, [date of publication not identified]
Buku Teks
Bernard, Chester I.
Harvard University Press , 1966
Buku Teks
Drucker, Peter Ferdinand, 1909-2005
Times Books International, 1985
Buku Teks SO
Mahoney, Thomas A.
Prentice-Hall, 1961
Buku Teks
by the editors of Fortune
Doubleday, 1956
Buku Teks