Martin lambert, Michael Leonard, Andrew Metcalfe
Taylor and Francis, 2009
Buku Teks
Carmichael, D.G., author
Ellis Horwood, 1981
Buku Teks
editors, Chris Bissell, Chris Dillon
Springer, 2012
eBooks
Shearer, J. Lowen, author
Prentice-Hall, 1997
Buku Teks
Basmadjian, Diran, author
Chapman & Hall/CRC , 2007
Buku Teks