Quintela, Peregrina, author
[Springer, ], 2012
eBooks
Angell, Pamela, author
McGraw-Hill, 2004
Buku Teks
Keen, Peter G. W., author
Harvard Business School Press, 1995
Buku Referensi
Epstein, Lita, author
John Wiley & Sons, 2009
Buku Teks
Johnson, Eldred A., author
McGraw-Hill, 1959
Buku Teks