Legouis, Emile, author
J.M. Dent and Sons, 1948
Buku Teks
Salzman, L.F., author
Oxford University Press, 1955
Buku Teks
Coote, Stephen, author
Penguin Group, 1988
Buku Teks
Lane-Poole, Stanley, 1854-1931, author
Methuen, 1968
Buku Teks
Stenton, Doris Mary
Penguin Books, 1952
Buku Teks