Barr, N. A. (1998). The economics of the welfare state (3rd ed.). Stanford University Press.
Dyfyniad Arddull ChicagoBarr, N. A. The Economics of the Welfare State. 3rd ed. Stanford, Calif.: Stanford University Press, 1998.
Dyfyniad MLABarr, N. A. The Economics of the Welfare State. 3rd ed. Stanford University Press, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.