Aston, Elaine, author
Routledge, 1991
Buku Teks
edited by John Parker
Pitman, 1952
Buku Referensi
Cameron, Kenneth M., author
Macmillan, 1968
Buku Teks
O`Casey, Sean, author
Macmillan, 1949
Buku Teks
Gransville, Wilfred, author
Philosophical Library, 1952
Buku Referensi