Baring-Gould, Sabine
Longman, 1906
Buku Teks
general editor, H.R. Loyn
Thames and Hudson, 1991
Buku Referensi
Hoyt, Robert S.
Harcourt, Brace & World, 1966
Buku Teks
Huizinga, Johan
New York: Doubleday, 1956
Buku Teks
Salzman, L.F.
Oxford University Press, 1955
Buku Teks