Dentler, R. A. (1972). Major social problems (2d ed.). Rand McNally.
Dyfyniad Arddull ChicagoDentler, Robert A. Major Social Problems. 2d ed. Chicago: Rand McNally, 1972.
Dyfyniad MLADentler, Robert A. Major Social Problems. 2d ed. Rand McNally, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.