@book{112980,
	author = {Van de Walle, John A.},
	title = {Teaching student-centered mathematics. Grades 5-8},
	publisher = {Pearson/Allyn and Bacon},
	year = {2006},
	series = {Van de Walle, John A. Van de Walle professional mathematics series},
	address = {[S.l.]},
	edition = {. ed.},
	url = {000029/00002993.jpg}
}