Francis, Thomas George, author
Longman, 1988
Buku Teks
Francis, Thomas George, author
ELBS, 1992
Buku Teks
Francis, Thomas George, author
Longman, 1971
Buku Teks
Neidle, Michael, author
McGraw-Hill , 1980
Buku Teks
Lewis, M. L. (Maurice L.)
Stanley Thornes, 1992
Buku Teks