@book{186930,
	author = {Krajcik, Joseph S. and Czerniak, Charlene Lochbihler.},
	title = {Teaching science in elementary and middle school classrooms},
	publisher = {McGraw-Hill},
	year = {c2003.},
	address = {Boston},
	edition = {2nd ed.},
	note = {Rev. ed. of: Teaching children science, c1999.}
}