1. Thinking and language;Affolter,1968
2. Developmental aspects of auditory and visual perception: An experimental investigation of central mechanisms of auditory and visual processing;Affolter,1970
3. Development of perceptual processes and problem-solving activities in normal, hearing-impaired, and language-disturbed children: A comparison study based on Piaget's conceptual framework;Affolter,1984
4. Perception and problem-solving activities;Affolter,1988