E.C. Young
Allen Lane, 1979
Buku Referensi
D. Jennings ... [et al.]
Edward Arnold, 1995
Buku Teks
Strangio, Christopher E., author
Prentice-Hall, 1980
Buku Teks
Strangio, Christopher E., author
Prentice-Hall, 1984
Buku Teks
Bignell, James, author
McGraw-Hill, 1985
Buku Teks