@book{34562,
	author = {Spector, Phil. and SpringerLink (Online service)},
	title = {Data Manipulation with R},
	publisher = {Springer New York,},
	year = {2008.},
	series = {Use R!},
	address = {New York, NY :},
	url = {http://dx.doi.org/10.1007/978-0-387-74731-6}
}