Dale, Ernest, author
McGraw-Hill, 1973
Buku Teks
Chanpman & Hall, 1996
Buku Teks
Burke, Ronald S.
McGraw - Hill , 1981
Buku Teks
Hitt, Michael A., author
West Publishing Company, 1989
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1954
Buku Teks