@book{55507,
	author = {Bird, Colin.},
	title = {An introduction to political philosophy /},
	publisher = {Cambridge University Press,},
	year = {2006.},
	series = {Cambridge introductions to philosophy},
	address = {Cambridge ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0729/2007296928-d.html}
}