1. Gross Motor Development in Infants Blind from Birth
2. Allegheny County Schools (1969). A demonstration project on developing independence in preschool handicapped children. Pittsburgh, PA: Author. (ERIC Document Reproduction Service No. ED 032 699)
3. Barraga, N. C. (1986). Sensory perceptual development. In G. T. School (Ed.), Foundation of education for blind and visually handicapped children and youth. New York American Foundation for the Blind.
4. Behl, D. (1987). The New Orleans visual impairment study. In K. R. White (Ed.), 1986-87 annual report of the longitudinal studies of the eficts and costs of early intervention for handia& children (Contract No. 800-85-0173). Logan: Early Intervention Research Institute, Utah State University. (ERIC Clearinghouse on Handicapped and Gifted Youth, No. ED 293 241)
5. From exploration to play: A cross-sectional study of infant free play behavior.