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2. Fukami, S and Arima, T.(2010): Tourists' image for Geoparks in Kyushu, Japan—From tourists survey result in 4 Geoparks—. Journal of Environmental Studies, Nagasaki University, 3, 47-54.
3. Iwate Prefecture (2014): Sightseeing Statistics of Iwate Prefecture (April to June, 2014) (Iwate No Kanko Tokei Ni Motozuku Tokeiryo Suikei Kekka).*
4. Jalan Research Center (2007): Survey Report of Domestic Travel Intention—Why People Traveled ?—(Kokunai Ryoko Ishiki Chosa: Hito Ha Naze Tabi Ni Derunoka Chosa).*
http://jrc.jalan.net/j/surveys.html [Cited 2015/3/6].
5. Jalan Research Center (2013): Jalan Survey Report of Domestic Tourism with Staying, 2013 (Jalan Shukuhaku Ryoko Chosa 2013).*
http://jrc.jalan.net/j/surveys.html [Cited 2015/3/6]