Goodyear Publishing Company, Inc., 1973
Buku Teks
Macleod, CIN
Antigonis NS 1974
Buku Teks
Haynes, Robert J.
George Allen and Unwin, 1980
Buku Teks
Duncanson, Dennis J
Oxford University Press, 1968
Buku Teks
Spiro, Herbert J
Van Nostrand Reinhold, 1969
Buku Teks