@book{62837,
	author = {Wieser, Friedrich, and Malloch, Christian A.},
	title = {Natural value :},
	publisher = {Macmillan and Co.,},
	year = {1893.},
	address = {New York :},
	url = {http://catalog.hathitrust.org/api/volumes/oclc/1967890.html}
}