Title: Explorations in Nonverbal and Vocal Behavior / Edition 1, Author: George F. Mahl
Title: Language and Communication in Mental Retardation: Development, Processes, and intervention / Edition 1, Author: Sheldon Rosenberg
Title: The Learning Tree: Overcoming Learning Disabilities from the Ground Up, Author: Stanley I. Greenspan
Title: The Soul in the Brain: The Cerebral Basis of Language, Art, and Belief, Author: Michael R. Trimble MD