Pollak,Robert A. (1989). The theory of the cost-of-living index. Oxford University Press.
Dyfyniad Arddull ChicagoPollak,Robert A. The Theory of the Cost-of-living Index. New York: Oxford University Press, 1989.
Dyfyniad MLAPollak,Robert A. The Theory of the Cost-of-living Index. Oxford University Press, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.