Thompson, F.G.
Longmans, Green and Co, Ltd., 1968
Buku Teks
Thompson, F.G.
Longman Scientific & Technical, 1992
Buku Teks
Thompson, F.G.
Longman Scientific and Technical, 1992
Buku Teks
Lewis, Maurice
Stanley Thornes Publishers, 1993
Buku Teks
Francis, Thomas George, author
Longman, 1988
Buku Teks