@book{18339,
	author = {Beard, Margaret Kent.},
	title = {The relation between dependency and retardation},
	publisher = {University of Minnesota,},
	year = {1919.},
	series = {Current problems ;},
	address = {[Minneapolis, Minn.] :},
	url = {http://www.archive.org/details/relationbetweend00bearrich}
}