7Skellenger A C, Hill E W. Effects of a shared teacher- child play intervention on the play skills of three young children who are blind. Journal of Visual Impairment and Blindness, 1994, (5) : 433 - 445
8Fergus P H. Children, play, and development. 2nd ed. Boston:Allyn and Bacon, Inc, 1995.21
9Skellenger A C, Rosenblum L P, Jager B K. Behaviors of preschoolers with visual impairments in indoor play settings. Journal of Visual Impairment and Blindness, 1997, (6) :519 - 530
10Troster H, Brambring M. The play behavior and play materials of blind and sighted infants and preschoolers. Journal of Visual Impairment and Blindness, 1994,88:421 - 432