1. Aramaki, S., Shirao, M., & Nagaoka, M. (Eds.). (1989). Sora kara mita Nihon no Kazan (An aerial view of Japan’s volcanoes). Tokyo: Maruzen.
2. Duraiappah, A. K., Nakamura, K., Takeuchi, K., Watanabe, M., & Nishi, M. (2012). Satoyama satoumi ecosystems and human well being: Socio ecological production landscapes of Japan. Tokyo: United Nations University Press.
3. Fennell, D. A. (2004). Ecotourism (2nd ed.). London: Routledge.
4. Fennell, D. A. (2014). Ecotourism (4th ed.). London: Routledge.
5. Google maps. https://www.google.com/maps/.