McNulty, James E., author
University of Pennsylvania Press, 1964
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1950
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1950
Buku Teks
Champion, Dean J., author
McGraw-Hill, 1975
Buku Teks
Mooney, James D., author
Harper & Row , 1974
Buku Teks