1. Miguel Sicart. 2014. Play Matters. The MIT Press. Miguel Sicart. 2014. Play Matters. The MIT Press.
2. Jonathan R. H. Tudge , Jill Brown and Lia B. L. Freitas . 2012 . The Cultural Ecology of Play: Methodological Considerations for Studying Play in Its Everyday Contexts. The Oxford Handbook of the Development of Play . DOI:10.1093/oxfordhb/9780195393002.013.0011 10.1093/oxfordhb Jonathan R. H. Tudge, Jill Brown and Lia B. L. Freitas. 2012. The Cultural Ecology of Play: Methodological Considerations for Studying Play in Its Everyday Contexts. The Oxford Handbook of the Development of Play. DOI:10.1093/oxfordhb/9780195393002.013.0011
3. Jean Piaget . 1971. The theory of stages in cognitive development. In D. R. Green , M. P. Ford , and G. B. Flamer (Eds.), Measurement and Piaget . New York, NY, US : McGraw-Hill . Jean Piaget. 1971.The theory of stages in cognitive development. In D. R. Green, M. P. Ford, and G. B. Flamer (Eds.), Measurement and Piaget. New York, NY, US: McGraw-Hill.
4. Mikael Wiberg . 2018. The Materiality of Interaction : Notes on the Materials of Interaction Design . The MIT Press . Mikael Wiberg. 2018.The Materiality of Interaction: Notes on the Materials of Interaction Design. The MIT Press.
5. Interactive Soft Toys for Infants and Toddlers - Design Recommendations for Age-appropriate Play