1. Änggård, E. (2011). Children’s gendered and non-gendered play in natural spaces. Children, Youth and Environments, 21(2), 5–33.
2. Aristotle. (2014). Nichomachean ethics. (trans. R. Crisp). Cambridge, UK: Cambridge University Press.
3. Arnold, H. E., Cohen, F. G., & Warner, A. (2009). Youth and environmental action: Perspectives of young environmental leaders on their formative influences. The Journal of Environmental Education, 40(3), 27–36.
4. Bandura, A. (1986). Social foundations of thought and action. Englewood Cliffs, NJ: Prentice-Hall.
5. Bandura, A. (1997). Self-efficacy. New York: W. H. Freeman.