http://mainichi.jp/life/edu/child/news/20111218ddm013100026000c.html

http://gigazine.net/news/20111218-let-it-snow-google/

http://www.asahi.com/national/update/1213/OSK201112120188.html

http://www.asahi.com/national/update/1217/TKY201112170155.html

http://gigazine.net/news/20111216-5-famous-billionaire-dropouts/

http://news.goo.ne.jp/article/lifehacker/life/lifehacker_20171.html?fr=rk

http://news.goo.ne.jp/article/lifehacker/life/lifehacker_20173.html?fr=rk

http://www.yuhikaku.co.jp/books/detail/9784641136137

http://headlines.yahoo.co.jp/hl?a=20111217-00000069-mai-soci