@book{88915,
	author = {Hanna, Lavone A. and Potter, Gladys L.},
	title = {Dynamic elementary social studies: unit teaching /},
	publisher = {Holt, Rinehart and Winston,},
	year = {[1973].},
	address = {New York },
	edition = {3d ed.},
	note = {Published in 1955-63 under title: Unit teaching in the elementary school.}
}