Burns, E. Bradford, author
Prentice-Hall, 1977
Buku Teks
Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Barton, Jonathan R.
Routledge, 1997
Buku Teks
Skidmore, Thomas E., author
Oxford University Press, 2001
Buku Teks
Skidmore, Thomas E., author
Oxford University Press, 1984
Buku Teks