FitzGerald, Jerry
Business data communications and networking
Wiley, 1996
 Buku Teks
Sparta, Kelle
The consultative real estate agent: building relationships that create loyal clients, get more referrals, and increase your sales
American Management Association, 2006
 eBooks
Sugiharto
Business plan Big's images
2009
 UI - Tesis Open
Edwards, Corwin D.
Big business and the policy of competition
Press of Western Reserve University, 1956
 Buku Teks
Warner, W. Lloyd
Big business leaders in America
Harper & Brothers , 1955
 Buku Teks