1. Vocational Habilitation of Severely Retarded Adults: a Direct Service Technology;Bellamy,1979
2. Experimental and Quasi-experimental Designs for Research;Campbell,1963
3. The organization of group care environments: the infant day care center;Cataldo,1972
4. The establishment and maintenance of a ward-based activity period;Coles,1979
5. Mental Handicap: Progress Problems and Priorities;Department of Health Social Security,1980