Finegan, Edward, author
Cambridge University Press, 2006
Buku Teks
Baker, Stanley B., author
Prentince-Hall, 1996
Buku Teks
Etzioni, Amitai, author
McGraw-Hill, 1983
Buku Teks
Perl, anthony
The University Press, 2002
Buku Teks
George E. Walker ... [and others]
Jossey-Bass, 2008
Buku Teks