Gray, Colin S., author
Routledge, 2006
Buku Teks
Random House, 1970
Buku Teks
Hall, John W., author
Yale University Press, 1974
Buku Teks
edited by D.V. Glass and D.E.C. Eversley
E. Arnold, 1965
Buku Teks
Taylor, A. J. P. (Alan John Percivale), 1906-1990
Harmondsworth Penguin Books 1976,
Buku Teks