@book{42259,
	author = {Van Dalen, Deobold B.},
	title = {Understanding educational research},
	publisher = {McGraw-Hill},
	year = {[1966]},
	series = {McGraw-Hill series in education: psychology and human development in education},
	address = {New York},
	edition = {Enl., rev.},
	note = {Includes index.}
}