1. The concept of difficult temperament;Bates;Merrill-Palmer Quarterly,1980
2. Measurement of infant difficultness;Bates;Child Development,1979
3. Individual differences in temperamental characteristics of infants;Birns;Transactions of the New York Academy of Sciences,1969
4. Dimensions of infant behavior;Bohlin;Infant Behavior and Development,1981
5. Neonatal Behavioral Assessment Scale;Brazelton,1973