@book{770110,
	author = { Boothroyd, Jennifer and  Boothroyd, Jennifer, , 1972- },
	title = {Loud or soft? High or low?: a look at sound.},
	publisher = {Lerner publishing group, inc.},
	year = {2011},
	series = {Lightning bolt books. Exploring physical science},
	address = {Minneapolis, USA: }
}