1. , and (1979). Specifications for selecting vocabulary and teaching methods for beginning braille readers. New York, NY: American Foundation for the Blind.
2. and (1957). Experimental designs, 2nd edn. New York, NY: Wiley.
3. (1982). Reading braille. In and (Eds), Tactual perception: A source book. Cambridge: Cambridge University Press.
4. Human information processing and sensory modality: Cross-modal functions, information complexity, memory, and deficit.