Stone, Bob
Prentice-Hall, 1986
Buku Teks
Carson, Gerald
University Press , 1954
Buku Teks
Wayland, Robert E
Harvard Business School Press, 1997
Buku Teks
Christensen, Mary, 1951- , author
American Management Association, 2008
eBooks
Leboff, Grant, author
Kogan Page, 2016
Buku Teks