Robertson, John
William Heinemann, 1981
Buku Teks
Esposito, Vincnet
Praeger, 1965
Buku Teks
Lawrence, Mark Atwood, author
Oxford University Press, 2010
Buku Teks
Jongsoo, James Lee
Palgrave Macmillan, 2006
Buku Teks
Horner, D.M., author
George Allen and Unwin, 1982
Buku Teks