1. Survey on Young Generation's attitude toward social awareness by the Cabinet Office (April 2013–March 2014), 〈http://www8.cao.go.jp/youth/kenkyu/thinking/h25/pdf/b2_1.pdf〉, pp. 25
2. JAXA Space Education Center: Japan Aerospace Exploration Agency (JAXA) Space Education Center, Report of JAXA Space Education Center on its Activities in 2014–2015, 2015, pp. 5–42
3. Web site of JAXA Space Education Center, 〈http://edu.jaxa.jp/education/partnership/usagereport/archive/2014.html〉
4. Survey from Ministry of Education, Culture, Sports, Science and Technology, 〈http://www.mext.go.jp/b_menu/shingi/chukyo/chukyo3/052/siryo/__icsFiles/afieldfile/2015/02/18/1355024_4.pdf〉
5. The Article from Tokyo News Paper 〈http://www.tokyo-np.co.jp/article/politics/list/201602/CK2016020202000261.html〉