Robson, R., author
Macmillan, 1957
Buku Teks
Grove, J.M.
Longmans, 1962
Buku Teks
edited by Tony Buxton, Paul Chapman and Paul Temple
Routledge , 1994
Buku Teks
Zupnick, Elliot, author
Columbia University Press, 1957
Buku Teks
by Gerald Manners ... [and others]
John Wiley & Sons, 1980
Buku Teks