Coppel, Charles A., author
Oxford University Press, 1983
Buku Teks
Reese, Charles D., author
CRC Press, Taylor & Francis Group, 2009
Buku Referensi
Firsan Nova, author
Rajawali, 2011
Buku Teks
Blumler, Jay G., author
Routledge, 1995
Buku Teks
Hodgson, Godfrey
Vintage Books, 1976
Buku Teks