Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1950
Buku Teks
Spriegel, William Robert, 1893-1972, author
Charles & Tuttle, 1958
Buku Teks
Asch, Peter
John Wiley & Sons, 1983
Buku Teks
McNulty, James E., author
University of Pennsylvania Press, 1964
Buku Teks
Mooney, James D., author
Harper & Row , 1974
Buku Teks