edited by Trevor Harley
Sage, 2011
Buku Teks
Garman, Michael
Cambridge University Press, 1990
eBooks
Edinburgh University Press, 1966
Buku Teks
Warren, Paul, 1958-
[Cambridge University Press, ], 2013
eBooks
edited by Masaru Tomita
Kluwer Academic, 1991
Buku Teks