@book{769999,
	author = { Boothroyd, Jennifer and  Boothroyd, Jennifer, , 1972- },
	title = {Give it a push! Give it a pull!: a look at forces},
	publisher = {Lerner publishing group, inc.},
	year = {2011},
	series = {Lightning bolt books. Exploring physical science},
	address = {Minneapolis, USA: }
}