Hoyt, Robert S., author
Harcourt, Brace & World, 1957
Buku Teks
Hoyt, Robert S., author
Harcourt, Brace & World, 1966
Buku Teks
Baring-Gould, Sabine, author
Longman, 1906
Buku Teks
general editor, H.R. Loyn
Thames and Hudson, 1991
Buku Referensi
Huizinga, Johan, author
New York: Doubleday, 1956
Buku Teks