Legge, John D.
Allen Lane The Penguin Press, 1972
Buku Teks
Brecher, Michael
Oxford University Press, 1959
Buku Teks
Legge, John D.
Penguin Books, 1973
Buku Teks
Crisp, L.F. (Leslie Finlay)
Angus and Robertson, 1963
Buku Teks
Economist Books, 1991
Buku Referensi