Hoyt, Robert S., author
Harcourt, Brace & World, 1966
Buku Teks
Painter, Sidney
Alfred A. Knopf, 1961
Buku Teks
general editor, H.R. Loyn
Thames and Hudson, 1991
Buku Referensi
Southern, R.W. (Richard William), 1912-2001, author
Cresset Librar, 1967
Buku Teks
Kirchner, Walther
Barnes & Noble. INC, 1968
Buku Teks