Thompson, F.G.
Longmans, Green and Co, Ltd., 1968
Buku Teks
Thompson, F.G.
Longman Scientific and Technical, 1992
Buku Teks
Walas, Stanley M., author
Butterworth-Heinemann, 1990
Buku Teks
Miller, Henry Arthur, author
Blackwell, 1994
Buku Teks
Francis, Thomas George, author
Longman, 1988
Buku Teks