Grove, J.M.
Longmans, 1962
Buku Teks
Cronin, James E., author
Routledge, 1991
Buku Teks
Walker, Gilbert
Heimann , 1957
Buku Teks
edited by Tony Buxton, Paul Chapman and Paul Temple
Routledge , 1994
Buku Teks
by Gerald Manners ... [and others]
John Wiley & Sons, 1980
Buku Teks