@book{39519,
	author = {Harris, Dale B. and University of Minnesota.},
	title = {The concept of development},
	publisher = {University of Minnesota Press,},
	year = {c1957},
	series = {Minnesota paperbacks ;},
	address = {Minneapolis :},
	note = {Papers presented at a conference held at the University of Minnesota, Dec. 8-10, 1955, to recognize the Institute of Child Welfare's productive work of three decades.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10231120}
}