@book{7315,
	author = {Gray, N.F.},
	title = {Water Technology: An Introduction for Environmental Scientists and Engineers},
	publisher = {Arnold,},
	year = {1999.},
	address = {Great Britain:},
	url = {http://books.google.com.pk/books/about/Water_Technology.html?id=p9e8r1b2UqwC&redir_esc=y}
}