Buchanan, Robert Angus, author
Penguin, 1972
Buku Teks
Palmer, Marilyn, author
Routledge, 1998
Buku Teks
Palmer, Marilyn, author
English Heritage, 2012
Buku Teks
edited by Paul K. Edwards
Blackwell , 1995
Buku Teks
Pollard, Sidney, author
Harvard University Press, 1965
Buku Teks