Adamthwaite, Anthony P.
ST. Martin's Press, 1981
Buku Teks
Moorad, George
E.P. Duttom, 1949
Buku Teks
Millar, T.B., author
Australian Nationsl University Press, 1978
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks
Orient Longman, 2005
Buku Teks