Hamel, Gary, author
Harvard Business School Press, 2002
Buku Teks
Abrahan, Joe,author
McGraw-Hill, 2011
Buku Teks
Daulay, Borkat, author
2016
UI - Skripsi (Membership)
Morrisey, George L., author
Pearson Education Asia, 2002
Buku Teks
Thompson, Mark P., author
Thompson and Brian Tracy, 2011
Buku Teks