1. The “need” for novelty: A comparison of six instruments;Acker;Psychological Record,1967
2. Origins of physiological regulations.;Adolph,1968
3. The development of the smiling response in early infancy;Ambrose,1961
4. The concept of a critical period for the development of social responsiveness in early human infancy;Ambrose,1963
5. Stimulation in early infancy.;Ambrose,1969