Buzan, Barry, author
Cambridge, 2005
Buku Teks
Rothwwell, Donald R., author
Cambridge University Press, 1996
Buku Teks
Marranci, Gabriele, author
Berg, 2006
Buku Teks
Zook, Chris, author
Harvard Business School Press, 2004
Buku Teks
Upfal, Annette
Hanuman Publishing, 1989
Buku Teks