Benson, O. E. (1969). Political science laboratory. C. E. Merrill Pub.
Dyfyniad Arddull ChicagoBenson, Oliver Earl. Political Science Laboratory. Columbus, Ohio: C. E. Merrill Pub, 1969.
Dyfyniad MLABenson, Oliver Earl. Political Science Laboratory. C. E. Merrill Pub, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.