@book{69804,
	author = {Bent, Rudyard Kipling and Kronenberg, Henry Harold},
	title = {Principles of secondary education},
	publisher = {McGraw-Hill},
	year = {[1970]},
	series = {McGraw-Hill series in education. Supervision, curriculum, and methods in education},
	address = {New York},
	edition = {6th ed.},
	note = {920903}
}