Laqueur, Walter
The Free Press, 1973
Buku Teks
Elliot, Florence, author
Penguin Books, 1957
Buku Referensi
edited by Edward Conrad Smith and Arnold John Zurcher
Barnes & Noble, 1966
Buku Teks
McCarthy, Eugene J., 1916-2005, author
Macmillan, 1962
Buku Teks
[publisher not identified], 1968
Buku Teks