Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1957
Buku Teks
Canot, Robert
New York Bantam Books c 1967
Buku Teks
Baruch, Bernard M.
Rinehart and Winston , 1960
Buku Teks
Westview Press, 1991
Buku Teks
Goulden, Joseph C., author
Atheneum, 1976
Buku Teks