Frances, Bryan:
Polity Press, 2014
Buku Teks SO
Cleese, John
BBC Worldwide Limited, 2003
Multimedia
Thomas G.M. Schalkhammer, editor
Birkhauser, 2002
Buku Teks SO
Sobti, R.C.
CRC Press, Taylor & Francis Group, 2009
Buku Teks SO
edited by Martin Fransman, Gerd Junne and Annemieke Roobeek
Blackwell, 1995
Buku Teks SO