@book{51594,
	author = {Anderson, Vernon Ellsworth and Gruhn, William Theodore},
	title = {Principles and practices of secondary education},
	publisher = {Ronald Press},
	year = {c1962.},
	series = {Douglass series in education},
	address = {New York},
	edition = {2d ed.},
	note = {Photocopy. Ann Arbor, Mich. : University Microfilms International, 1980.}
}