@book{50450,
	author = {Head, K. H., and Epps, R. J.,},
	title = {Manual of soil laboratory testing.},
	publisher = {Whittles Publishing,},
	year = {[2011]},
	address = {Dunbeath, Scotland :},
	edition = {Third edition.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10904588}
}