1. Ackerman, D. (1999). Deep play. Random House.
2. Beggs, J., Murphy, C., & Kerr, K. (2009). Inspiring Einstein minds. Primary Science, 109, 17–21.
3. Bodrova, E., & Leong, D. (2007). Playing for academic skills. In Children in Europe: Vygotsky edition (pp. 10–11). Children in Scotland.
4. Bronfenbrenner, U., & Morris, P. (2006). The ecology of developmental processes. In W. Damon & R. M. Lerner (Eds.), Handbook of child psychology volume 1: Theoretical models of human development (6th ed., pp. 793–828). Wiley.
5. Cowles, H. (2017). Child’s play. Aeon Magazine. Retrieved from https://aeon.co/essays/how-the-scientific-method-came-from-watching-children-play