Amamoo, J.G.
Pan Books , 1958
Buku Teks
Alexander, H. T.
Frederick A. Praeger, 1966
Buku Teks
Stephens, Ian, author
Penguin Books, 1964
Buku Teks
Wriggins, W. Howard
Princeton University Press, 1960
Buku Teks
Stoppard, Miriam
Dorling Kindersley , 1991
Buku Teks