@book{20375,
	author = {National Education Association of the United States.},
	title = {The problem of mathematics in secondary education.},
	publisher = {Govt. print. off.,},
	year = {1920.},
	series = {U.S. Bureau of education. Bulletin 1920,},
	address = {Washington,},
	note = {At head of title: Department of the interior. Bureau of education ...}
}