@book{2853,
	author = {Janssen, L. H.},
	title = {Free trade, protection and customs union /},
	publisher = {H. E. Stenfert Kroese,},
	year = {c1961.},
	series = {Publication of the Economisch Sociologisch Instituut, Tilburg},
	address = {Leiden :},
	url = {http://www.worldcat.org/title/free-trade-protection-and-customs-union/oclc/1044679&referer=brief_results}
}