Layard, John
London Chatto & Windus 1942
Buku Teks
Firth, John Rupert, author
Oxford University Press, 1964
Buku Teks
Aidoo, Kofi
Longman, 1994
Buku Teks
Campbell, Paul B., author
Himmat Publications Trust , 1970
Buku Teks
Collier, Abram T., author
Harper & Row, 1962
Buku Teks