Mitchell, William J., author
MIT Press , 2000
Buku Teks
Zyman, Sergio, author
Harper Business, 2000
Buku Teks
Zyman, Sergio, author
John Wiley & Sons, 2002
Buku Teks
McIntosh, Jane, author
Checkmark Books, 1999
Buku Referensi
Borner, Katy, author
MIT Press, 2010
Buku Referensi