Charles, I. (1970). The social security program in the United States (2d ed.). Appleton-Century-Crofts.
Dyfyniad Arddull ChicagoCharles, I. The Social Security Program in the United States. 2d ed. New York: Appleton-Century-Crofts, 1970.
Dyfyniad MLACharles, I. The Social Security Program in the United States. 2d ed. Appleton-Century-Crofts, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.