Drucker, Peter Ferdinand, 1909-2005, author
Harper Business, 2001
Buku Teks
Merril, Harwood F.
New York, N.Y., American management Assoc
Buku Teks
Horrell, Edward, author
American Management Association, 2006
eBooks
edited by Elizabeth Marting
D.B. Taraporevala Sons, 1970
Buku Teks
Marting, Elizabeth, author
American Management Association, 1959
Buku Teks