Bryson, bill
Black Swan , 1998
Buku Teks
Ueberroth, Peter, author
William Morrow, 1985
Buku Teks
Kunstler, James Howard, author
Simon and Schuster, 1993
Buku Teks
Mahoney, Tom, author
Harper & Row, 1966
Buku Teks
New York: W.W.Norton & Company, 1988,
Buku Referensi