1. A decade of infant conditioning and learning research;Fitzgerald;Merrill-Palmer Quarterly of Behavior and Development,1971
2. The developmental psychology of Jean Piaget;Flavell,1963
3. Research opportunities with Playtest systems in psychological studies of infant development;Friedlander;Mental Development Centre Research Bulletin No. 2,1965
4. Effect of spatial separation of stimulus, response and reinforcement on selective learning in children;Jeffrey;Journal of Experimental Psychology,1964
5. Effects of controlled audio-visual reinforcement on infants' manipulative play in the home;Leuba;Journal of Experimental Child Psychology,1968