Edited by John Hogan, Michael Howlett
Palgrave Macmillan, 2015
Buku Teks
edited by Wil A.H. Thissen and Warren E. Walker
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Buku Teks
Gilbert, Bentley B.
B.T. Bastford, Ltd., 1970
Buku Teks
Smith, Kevin
Westview Press, Boston, Massachusetts : Credo Reference, 2013
Buku Teks
Sullivan, Michael
Harvester Wheatsheaf, 1994
Buku Teks