1. The Aviation Herald. 2011. Tsunami Rolls through Pacific, Sendai Airport under Water, Tokyo Narita Closed, Pacific Region Airports Endangered. March 11. http://avherald.com/h?article=43928907&opt=0 .
2. BBC (British Broadcasting Corporation). 2011. Yen Hits Record-High against US Dollar as Nikkei Falls. March 17. http://www.bbc.co.uk/news/business-12768098 .
3. Cabinet Office, Government of Japan. 2011. On the Estimation of Loss of the Great Eastern Japan Earthquake (東日本大震災に被害額被推計て). http://www.bousai.go.jp/oshirase/h23/110624-1kisya.pdf .
4. CBS News. 2011. Earth’s Day Length Shortened by Japan Earthquake. March 13. http://www.cbsnews.com/stories/2011/03/13/scitech/main20042590.shtml .
5. Chai, C. 2011. Japan’s Quake Shifts Earth’s Axis by 25 Centimetres. Montreal Gazette (Postmedia News), March 11. http://www.webcitation.org/5x95t0CLU .