@book{20487,
	author = {Camp, Harold Laverne.},
	title = {Scales for measuring results of physics teaching,},
	publisher = {The University},
	year = {[1921]},
	series = {University of Iowa studies in education ...},
	address = {Iowa City,},
	note = {On cover: University of Iowa studies. 1st ser., no. 54. October 1, 1921.}
}