Gunther, John, 1901-1970, author
Harper & Brothers, 1941
Buku Teks
Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Barton, Jonathan R.
Routledge, 1997
Buku Teks
Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
Skidmore, Thomas E., author
Oxford University Press, 2001
Buku Teks