Orriss, H. D. (1977). EMPLOYMENT OF MENTALLY HANDICAPPED PEOPLE.
Dyfyniad Arddull ChicagoOrriss, H. D. EMPLOYMENT OF MENTALLY HANDICAPPED PEOPLE. 1977.
Dyfyniad MLAOrriss, H. D. EMPLOYMENT OF MENTALLY HANDICAPPED PEOPLE. 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.