@book{21331,
	author = {Koon, Cline Morgan,},
	title = {The art of teaching by radio,},
	publisher = {U.S. Govt. print. off.,},
	year = {1933.},
	series = {U. S. Office of education. Bulletin, 1933,},
	address = {Washington,},
	note = {At head of title: United States Department of the interior.  Harold L. Ickes, secretary. Office of education. William John Cooper, commissioner.}
}