Batten, J. D.
D.B. Taraporevala Sons & Co., 1963
Buku Teks
McGivering, Ian C.
Liverpool University Press, 1960
Buku Teks
Chapple, Eliet D.
Macmillan, 1961
Buku Teks
McFarland, Dalton E., author
Collier Macmillan, 1974
Buku Teks
Haire, Mason, author
McGraw-Hill, 1964
Buku Teks