@book {557,
	title = {The Spirit Level: Why Greater Equality Makes Societies Stronger},
	year = {2011},
	publisher = {Bloomsbury USA},
	organization = {Bloomsbury USA},
	isbn = {9781608193417},
	url = {http://www.bloomsbury.com/us/the-spirit-level-9781608191703/},
	author = {Wilkinson, R. and Pickett, K.}
}
