1. Appleton, J. (1975). The experience of landscape. London: Wiley.
2. Balling, J. D., & Falk, J. H. (1982). Development of visual preference for natural environments. Environment and Behavior, 14, 5–28.
3. Cerling, T., Wynn, J., Andanje, S. A., Bird, M., Korir, D., Levin, N., et al. (2011). Woody cover and hominin environments in the past 6 million years. Nature, 476, 51–56.
4. Dutton, D. (2003). Aesthetics and evolutionary psychology. In J. Levison (Ed.), The Oxford handbook for aesthetics. New York: Oxford University Press.
5. Eisenberg, E. (1998). The ecology of Eden: An inquiry into the dream of paradise and a new vision of our role in nature. New York: Random House.