http://www.cetera.co.jp/treasure/

http://www.alc.co.jp/business/article/dictionary/

http://comic-walker.com/contents/detail/KDCW_CW01000034010000_68/

http://tamashii.jp/item/10174/

http://research.cesa.or.jp/iiohanashi.html

http://www.jp.playstation.com/20th/history/

http://japan.unity3d.com/developer/document/tutorial/2d-shooting-game/