Reilly, Kevin, author
Harper and Row, c1980
Buku Teks
Ewing, Ethel E., author
Rand McNally & Company, 1962
Buku Teks
Toynbee, Arnold J., author
Meridian Books, 1958
Buku Teks
Blois, Lukas de, author
Routledge, 1997
Buku Teks
Pernoud, Regine, author
Dennis Dobson, 1950
Buku Teks