Letter: To the Editor

Acredolo L.P. (1983). Spatial orientation in special populations: The mentally retarded, the blind, and the elderly. In Pick H. L. Jr. , & Acredolo L.P. (Eds.), Spatial orientation: Theory, research, and application. New York: Plenum Press.

Chi M.T.H. , and Rees E.T. (1983). A learning framework for development. In Chi M.T.H. (Ed.), Contributions to human development. Basel: Karger.

Flavell J.H. (1985). Cognitive development. Englewood Cliffs, NJ: Prentice-Hall.

Hill E. , Rosen S. , Correa V.I. , and Langley M.B. (1984). Preschool orientation and mobility: An expanded definition. Education of the Visually Handicapped, 15(2), 58–72.

Lowenfeld B. (1975). The changing status of the blind: From separation to integration. Springfield, IL: Thomas.

Nelson K. , and Greundel J. (1981). Generalized event representations: Basic building blocks of cognitive development. In Lamb M.E. , Brown A.L. (Eds.), Advances in Developmental Psychology, (Vol. I). Hillsdale, NJ: Erlbaum.

Piaget J. , and Inhelder B. (1956). The child's concept of space. (F.J. Langdon & J.L. Lunzer, trans.). London: Routledge and Kegan Paul. (Original work published 1948)

Rieser J.J. , Guth D.A. , and Hill E.W. (1982). Mental processes mediating independent travel: Implications for orientation and mobility. Journal of Visual Impairment & Blindness, 76, 213–218.

Schmidt R.A. (1982). Motor control and learning. Champaign, IL: Human Kenetics Publishers.

Warren D.H. (1984). Blindness and early childhood development, (2nd ed.). New York: American Foundation for the Blind.