Bowes, William H., author
John Wiley & Sons, 1984
Buku Teks
Benham, P.P., author
ELBS/Longman, 1988
Buku Teks
Popov, Egor P., author
Prentice-Hall, 1978
Buku Teks
Roylance, David
John Wiley & Sons, 1996
Buku Teks
Kumar, Kamal, author
Khanna, 1979
Buku Teks