Carr, E.H. (Edward Hallet), author
Penguin Books, 1975
Buku Teks
Hoffman, Ross J.S., author
Littlefield, Adams, 1958
Buku Teks
Berenson, Bernard, 1865-1959, author
Doubleday Anchor Books, 1953
Buku Teks
Dahl, Svend, author
Scarecrow Press, 1968
Buku Teks
Butterfield, H., author
Charles Scribner's Sons, 1950
Buku Teks