http://ko.wikipedia.org/wiki/%EC%82%AC%EC%9A%A9%EC%9E%90:%ED%95%9C%EB%AF%BC%EC%A1%B1
http://blog.naver.com/kjisoo0208.do
http://kr.blog.yahoo.com/jisoo371/MYBLOG/yblog.html?pc%3D5
http://ko.wikisource.org/wiki/%EC%82%AC%EC%9A%A9%EC%9E%90:%ED%95%9C%EB%AF%BC%EC%A1%B1