1. A comparison of lecture versus role-playing in the training of the use of positive reinforcement;Adams;J. organisational Behav. Mgmt,1980
2. The progress of developmentally delayed pre-school children in a home-training scheme;Barna;Child: Care. Hlth Dev.,1980
3. Behavioural research on severe and profound mental retardation (1955–1974);Berkson;Am. J. Ment. Defic.,1977
4. Experimental and Quasi-experimental Designs for Research;Campbell,1963
5. Kirklees Pre-pilot Portage Project Evaluation Report;Cusworth,1980