Kao, John J., author
Prentice-Hall, 1991
Buku Teks
Kay, Ronald, author
[Springer, ], 2012
eBooks
Harvard Business School Press, 2004
Buku Teks
Edo Setyadi, author
2016
UI - Skripsi (Membership)
Elex Media Komputindo, Kelompok Gramedia, 2002
Buku Teks