Haley, Jay
Harper & Row, 1978
Buku Teks
Berlin, Isaiah
Princeton University Press, 2001
Buku Teks
Rose, Arnold M.
UNESCO, 1951
Buku Teks
Buzo, Alex
Angus and Roberson Publishers, 1975
Buku Teks
Dawson, Steve
Marshall Cavendish Edition, 2010
Buku Teks