Haynes, Robert J.
George Allen and Unwin, 1980
Buku Teks
Goss, Sue., author
Palgrave, 2001
Buku Teks
Stoker, Gerry, author
Macmillan, 1991
Buku Teks
Jackson, R.M. (Richard Meredith), 1903-1986, author
Macmillan, 1959
Buku Teks
Elcock, Howard, author
Routledge, 1994
Buku Teks