@book{24233,
	author = {Kaddoura, Sam.},
	title = {Echo made easy /},
	publisher = {Churchill Livingstone,},
	year = {2009.},
	address = {Edinburgh ;},
	edition = {[2nd ed.]},
	url = {http://www.loc.gov/catdir/toc/ecip089/2008002607.html}
}