Marilyn R. Seymann, editor
Glenlake Publishing Company, 1998
Buku Referensi
Banham, John, 1940-, author
Weidenfeld and Nicholson, 1994
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Truman Talley Books/Plume, 1992
Buku Teks
Chattell, Alf
Macmillan, 1995
Buku Teks
Montana, Patrick J.
New York, N.Y. American Management Asseciation 1967,
Buku Teks