1. Playfulness: Definition, design, and measurement;Barnett;Play and Culture,1990
2. Characterizing playfulness: Correlates with individual attributes and personality traits;Barnett;Play and Culture,1991
3. The playful child: Measurement of a disposition to play;Barnett;Play and Culture,1991
4. Concomitants of playfulness in early childhood: Cognitive abilities and gender;Barnett;Journal of Genetic Psychology,1982
5. Playfulness and the early play environment;Barnett;Journal of Genetic Psychology,1984