@book{769981,
	author = { Boothroyd, Jennifer and  Boothroyd, Jennifer, , 1972- },
	title = {How big? how heavy? how dense?: a look at matter},
	publisher = {Lerner publishing group, inc},
	year = {2011},
	series = {Lightning bolt books. Exploring physical science},
	address = {Minneapolis, USA }
}