1. Errorless learning with the retarded;Cullen;Nursing Times,1976
2. Prevention of incorrect responding for establishing instruction following behaviours;Duker;J. Ment. Defic. Res.,1981
3. Programming stimuli in matching to sample;Hively;J. Experi. Anal. Beh.,1962
4. Learning without errors;Joyce;Apex, J. Brit. Inst. Ment. Hand.,1981