Christensen, Ralph, author
American Management Association, 2006
eBooks
Martin, Ann M., author
Apple Paperback, 1986
Buku Teks
Kalakota, Ravi, author
Addison-Wesley, 2001
Buku Teks
Lovejoy, Arthur O.
Harper Torchbooks, 1960
Buku Teks
Johnston, Robert E., author
American Management Association;, 2013
eBooks