1. Angrosino, M. V. (2016). Naturalistic observation. Routledge.
2. Ball, D. J., Gill, T., & Spiegal, B. (2008). Department for Culture, Media and Sport (DCMS).
3. Barron, C., Beckett, A., Coussens, M., Desoete, A., Cannon Jones, N., Lynch, H., Prellwitz, M., & Fenney Salkeld, D. (2017). Barriers to play and recreation for children and young people with disabilities: Exploring environmental factors. De Gruyter.
4. Development of a Taxonomy of Pretend Play for Children With Disabilities
5. Children's Play in Natural Environments and Their Development of Microcultures: "We Were Born in the Wilderness"