Gower, Barry
Routledge, 1997
Buku Teks
Oakley, Barry
Currency Press, 1975
Buku Teks
Emmitt, stephen, author
Wiley-Blackwell, 2010
Buku Teks
Akeel Bilgrami, Prafulla C. Kar, editor
Routledge, 2011
Buku Teks
Taylor, Paul C., author
Polity Press, 2013
Buku Teks