@book{21723,
	author = {Cook, Katherine Margaret O'Brien. and Reynolds, Florence Evan,},
	title = {Opportunities for the preparation of teachers in the use of visual aids in instruction,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1940.},
	series = {United States. Office of Education. Pamphlet},
	address = {Washington,}
}