Stratton, Florence
Routledge, 1994
Buku Teks
Paolo Janni
The council for research in values and philoaophy, 2001
Buku Teks
McLaren, John
Cambridge University Press, 1996
Buku Teks
Williams, Louise Blakeney
Cambridge University Press, 2009
eBooks
Wall, Derek
Routledge , 1994
Buku Teks