Murphy, Herta A., author
McGraw-Hill, 1991
Buku Teks
Gartside, L. (Leonard), author
Macdonald and Evans, 1982
Buku Teks
King, F.W
Longmans , 1979
Buku Teks
Davis, Ken
Charles E. Merrill Publishing Company, 1983
Buku Teks
Chappel, R.T., author
Macdonald and Evans, 1976
Buku Teks