1. 1) Maruya, H : Significance and Economic Effect of Business Continuity Plan, Gyosei Co., p. 2, 2008 (in Japanese).
2. 2) Cabinet Office : Survey on the Actual Situation of Companies in Business Continuity and Disaster Reduction, pp. 5-16, 2010 (in Japanese). http://www.bousai.go.jp/oshirase/h22/100330-1kisya.pdf
3. 3) Cabinet Office : Business Continuity Guidelines, First Edition, 2005 (in Japanese). http://www.bousai.go.jp/MinkanToShijyou/guideline01.pdf
4. 4) Cabinet Office : Business Continuity Guidelines, Second Edition, 2009 (in Japanese). http://www.bousai.go.jp/MinkanToShijyou/guideline02.pdf
5. 5) Tohoku Economic Foundation : the Questionnaire Survey on the Effect of the Great East Japan Earthquake, pp. 1-6, 2011 (in Japanese). http://www.tokeiren.or.jp/press/pdf/1315386682-110907-sinsai.pdf