@book{81503,
	author = {Adams, George Burton,},
	title = {Civilization during the middle ages :},
	publisher = {C. Scribner's Sons,},
	year = {c1922.},
	address = {New York :},
	edition = {Rev. ed.},
	url = {http://catalog.hathitrust.org/api/volumes/oclc/387773.html}
}