Weatherall, Thomas, author
Cambridge University Press, 2015
Buku Teks
Costelloe, Daniel, author
Cambridge University Press, 2017
Buku Teks
edited by Nigel D. White, Christian Henderson
Edward Elgar Publishing, 2013
Buku Teks
Elliot, Catherine, author
Longman , 2001
Buku Teks
McKendrick, Ewan, author
Macmillan, 1994
Buku Teks