1. Statistics: An Introduction for Students in the Behavioral Sciences;Adkins,1964
2. Children's Apperception Test;Ballak,1949
3. A First Language: The Early Stages;Brown,1973
4. Mean length of spoken sentences as a function of stimulus, experimenter, and subject;Cowan;Child Dev.,1967
5. Peabody Picture Vocabulary Test;Dunn,1965