Gardiner, Eileen, author
Cambridge University Press, 2015
Buku Teks
Berry, David M. (David Michael), author
Polity Press, 2017
Buku Teks SO
Baxes, Gregory A., author
Prentice-Hall, 1984
Buku Teks
Irwan Prasetya Gunawan, author
Universitas Multimedia Nusantara, Center for New Media ICT Research, 2010
Artikel Jurnal
Wijaya Widjanarka N., author
Erlangga, 2006
Buku Teks