Silvertown, Jonathan W., author
Longman, 1987
Buku Teks
Etherington, John R., author
John Wiley & Sons, 1982
Buku Teks
Etherington, John R., author
Wiley Eastern, 1976
Buku Teks
Etherington, John R., author
John Wiley & Sons, 1975
Buku Teks SO
Barbour, Michael G., author
The Benjamin/Cummings , 1987
Buku Teks