1. Bornstein, M. H. (2007). On the significance of social relationships in the development of children’s earliest symbolic play: An ecological perspective. In G. Artin & S. Gaskins (Eds.), Play and development: Evolutionary, sociocultural, and functional perspectives (pp. 101–130). New York: Psychology Press.
2. Chaiklin, S. (2012). A conceptual perspective for investigating motive in cultural-historical theory. In M. Hedegaard, A. Edwards, & M. Fleer (Eds.), Motives in children’s development: Cultural-historical approaches (pp. 209–224). Cambridge: Cambridge University Press.
3. Davydov, V. V., Zinchenko, V. P., & Talyzina, N. F. (1983). The problem of activity in the work of A.N. Leontiev. Soviet Psychology, 24(1), 22–26.
4. Eggum-Wilkens, N. D., Fabes, R. A., Castle, S., Zhang, L., Hanish, L. D., & Martin, C. L. (2014). Playing with others: Head Start children’s peer play and relations with kindergarten school competence. Early Childhood Research Quarterly, 29, 345–356.
5. Fleer, M. (2014). The demands and motives afforded through digital play in early childhood activity settings. Learning, Culture and Social Interaction, 3(3), 202–209.