Ketchum, Richard M., author
American Heritage Publishing, 1960
Buku Teks
Crane, Stephen, author
Wilco Publishing House, 2005
Buku Teks
Chafe, William Henry
Oxford University Press, 1995
Buku Teks
Moore, John A.
Macmillan Publishing Company, 1985
Buku Teks
Derbyshire, Ian
Chambers, 1990
Buku Teks