Ramsoy, O. 1. (1963). Social groups as system and subsystem ([1st American ed.].). Free Press of Glencoe.
Dyfyniad Arddull ChicagoRamsoy, Odd 1924. Social Groups as System and Subsystem. [1st American ed.]. New York: Free Press of Glencoe, 1963.
Dyfyniad MLARamsoy, Odd 1924. Social Groups as System and Subsystem. [1st American ed.]. Free Press of Glencoe, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.