Roberts, Geoffrey
Manchester University Press, 1984
Buku Teks
Pedini, Mario
Aldo Martello [, [date of publication not identified]
Buku Teks
Parker, R. A. C.
Weidenfeld and Nicolson, 1969
Buku Teks
Europa Publications Limited, 1970
Buku Referensi
Charles, J.B., 1910-, author
Bezige Bij, 1968
Buku Teks