@book{75147,
	author = {Baker, Ann,},
	title = {Ship or sheep? :},
	publisher = {Cambridge University Press,},
	year = {1981. 1977},
	address = {Cambridge ;},
	edition = {2nd ed., new ed.},
	url = {http://www.loc.gov/catdir/description/cam022/81018082.html}
}