1. Promoting positive early interactions: Assessment process;Baird,1990
2. Playfulness: Definition, design, and measurement;Barnett;Play and Culture,1990
3. Parent-child interaction and social-emotional development;Beckwith,1985
4. Associations and dissociations in language and symbolic play of children with Down syndrome;Beeghly,1988
5. An organizational approach to symbolic development in children with Down syndrome;Beeghly;New Directions in Child Development,1987