general editor, H.R. Loyn
Thames and Hudson, 1991
Buku Referensi
Hoyt, Robert S., author
Harcourt, Brace & World, 1966
Buku Teks
Huizinga, Johan, author
New York: Doubleday, 1956
Buku Teks
Salzman, L.F., author
Oxford University Press, 1955
Buku Teks
Coote, Stephen, author
Penguin Group, 1988
Buku Teks