Winch, Peter
Routledge, 1995
Buku Teks
Engelmann, Karen
Harper Collins, 2012
Buku Teks
edited by Hedwig te Molder, Jonathan Potter
Cambridge University Press, 2005
Buku Teks
Clift, Rebecca
Cambridge University Press, 2016
Buku Teks
Asher, Nicholas
Cambridge University Press, 2003
Buku Teks SO