Pace, James B2012-03-132012-03-1319711971Source: Dissertation Abstracts International, Volume: 72-05, Section: B, page: .http://hdl.handle.net/10393/21324http://dx.doi.org/10.20381/ruor-17457Abstract not available.190 p.Psychology, Developmental.Operant conditioning procedures with profoundly retarded children in the acquisition of conceptsThesis