1. Extinction of the smiling response in infants as a function of reinforcement schedule;Brackbill;Child Developm.,1958
2. A learning analysis of the effects of normal stimulation, privation and deprivation on the acquisition of social motivation and attachment;Gewirtz,1961
3. Social test observation manual;Gewirtz,1963
4. The course of infant smiling in four child-rearing environments in Israel;Gewirtz,1965