Citra Ferima
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Tesis Open
Navarro, Peter
Pearson Education, 2006
Buku Teks
Warren, Kim
John Wiley & Sons, 2002
Buku Teks
Harvard Business School Press, 1999
Buku Teks
Pearce, John A.
Richard D. Irwin, 1982
Buku Teks