http://internet.watch.impress.co.jp/cda/news/2007/12/26/18014.html

http://yamaonosuke.blogzine.jp/honke/2008/01/post_0e35.html

http://gigazine.net/index.php?/news/comments/20080105_expensive_legal_pets/

http://news.goo.ne.jp/article/asahi/nation/K2008010402650.html

http://www.yomiuri.co.jp/national/news/20080106i201.htm

http://www.nikkei.co.jp/news/shakai/20080106AT1G2804M05012008.html

http://yamagata-np.jp/newhp/kiji_2/200801/06/news20080106_0060.php