Bento, G., & Dias, G. (2017). The importance of outdoor play for young children’s healthy development. Porto Biomedical Journal, 2(5), 157-160. doi: 10.1016/j.pbj.2017.03.003.
Dowdell, K., Gray, T., & Malone, K. (2011). Nature and its influence on children’s outdoor play. Australian Journal of Outdoor Education, 15(2), 24-35. Retrieved from 9 February 2018 from http://www.freepatentsonline.com/article/Australian-Journal-Outdoor-Education/282583218.html.
Little, H., Wyver, S., & Gibson, F. (2011). The influence of play context and adult attitudes on young children’s physical risk‐taking during outdoor play. European Early Childhood Education Research Journal, 19(1), 113-131. doi: 10.1080/1350293X.2011.548959.