Solso, Robert L., 1933-, author
MIT Press, 1994
Buku Teks
Brekhus, Wayne.
MA Polity Press, 2015
Buku Teks
Ashcraft, Mark H., author
Longman, 1998
Buku Teks
McCown, Donald, author
Springer, 2016
Buku Teks
edited by Ron Sun
Cambridge University Press, 2008
Buku Referensi