Warren, Robert Penn
A Harvest Book, 2006
Buku Teks
Layard, John
London Chatto & Windus 1942
Buku Teks
Firth, John Rupert, author
Oxford University Press, 1964
Buku Teks
Campbell, Paul B., author
Himmat Publications Trust , 1970
Buku Teks
Collier, Abram T., author
Harper & Row, 1962
Buku Teks