Boyd, Robin
Penguin Books, 1968
Buku Teks
Marshall, Alan, 1902-1984
Hyland House, 1981
Buku Teks
Oxford University Press, 1969
Koleksi Publik
Clark, Manning, 1915-1991
New American Libray, 1980
Buku Teks
edited by Clement Semmler and Derek Whitelock
F.W. Cheshire, 1966
Buku Teks