@book{41107,
	author = {Buchanan, James M. and Rowley, Charles Kershaw},
	title = {The calculus of consent  logical foundations of constitutional democracy},
	publisher = {Liberty Fund},
	year = {2004},
	series = {The Selected Works of Gordon Tullock},
	address = {Indianápolis (Indiana, Estados Unidos)},
	note = {Also published by Liberty Fund as v. 3 of The collected works of James M. Buchanan. c1999. With new foreword, note on Buchanan by Tullock, and index},
	url = {http://www.loc.gov/catdir/enhancements/fy1204/2004044230-t.html}
}