@book{55533,
	author = {Rutherford, Andrew, and ebrary, Inc.},
	title = {Introducing Anova and Ancova},
	publisher = {SAGE,},
	year = {2000.},
	series = {Introducing statistical methods},
	address = {London :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10080883}
}