1. The World is Flat: A Brief History of the Twenty-First Century;Friedman,2005
2. R. Ichiro, T. Amano, SoftBank to Sell Robot in US Stores Within 12 Months. 2014 September 2, 2014 [cited 2014 November 15]. Available from: http://www.bloomberg.com/news/2014-09-02/softbank-to-sell-robot-in-u-s-stores-within-12-months.html.
3. SoftBank Mobile Corp. and Aldebaran Robotics SAS. SoftBank Mobile and Aldebaran Unveil Pepper—the World’s First Personal Robot That Reads Emotions, 2014 [cited 2014 June 8]. Available from: http://www.softbank.jp/en/corp/group/sbm/news/press/2014/20140605_01/.
4. Amazon.com, I. Amazon Prime Air, 2014 [cited 2014 July 30]. Available from: http://www.amazon.com/b?node=8037720011.
5. Google drones lift industry hopes: Internet Giant’s entry brings financial and lobbying clout to fledging field;Barr;Wall Street J.,2014