Worrall, David
Harvester Wheatsheaf, 1992
Buku Teks
Kershaw, Baz
Routledge, 1992
Buku Teks
Simpson, Leanne, 1971-, author
University of Minnesota Press, 2017
Buku Teks
Ilbert, Courtenay
Oxford University Press , 1947
Buku Teks
Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks