Perkins, J.O.N.
Sun Books, 1968
Buku Teks
Williams, Morris
Longman, 1972
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks
edited by Gordon Greenwood and Norman Harper
F.W. Cheshire, 1957
Buku Teks
edited by Greg Crouch, Ted Wheelwright, Ted Wilshire
Penguin Books, 1980
Buku Teks