Etherington, John R.
Wiley Eastern, 1976
Buku Teks
Etherington, John R.
John Wiley & Sons, 1975
Buku Teks SO
Silvertown, Jonathan W.
Longman, 1987
Buku Teks
Barbour, Michael G.
The Benjamin/Cummings , 1987
Buku Teks
edited by J.R. Porter and D.W. Lawlor
Cambridge University Press , 1991
Buku Teks