1. Brambring M. Development of Blind Children. A Longitudinal Study, University of Bielefeld Germany, Faculty of Psychology and Sport Sciences, 1992 (personal communication).
2. Working with parents;Ferrell,1986
3. Intelligence testing for visually impaired persons;Vander Kolk;J Vis Impair Blindness,1977
4. Blindness and early childhood development;Warren,1984
5. Blindness and children: an individual different approach;Warren,1994