Thomas Wijasa Bratawidjaja, author
Pustaka Binaman Presindo , 1994
Buku Teks
Covey, Stephen R., author
Gramedia, 2005
Buku Teks
Toynbee, Arnold J., author
Oxford University Press, 1966
Buku Teks
Covey, Stephen R., author
Free Press, 2004
Buku Teks
Mackoff, Barbara, author
American Management Association, 2001
Buku Teks