Cambridge University Press, 2003
eBooks
Russell, John David, author
Johns Hopkins University Press, 1979
Buku Teks
edited by Nick Bentley
Routledge, 2005
Buku Teks
Hewit, Douglas, author
Longman , 1988
Buku Teks
edited by Theo D`Haen and Hans Bertens
Rodopi, 1993
Buku Teks