[1] OAuth Echo | Twitter Developers ( 版) <https://dev.twitter.com/oauth/echo>
[2] OAuth Echo - Identity Verification Delegation (Draft ( 版) <http://ja.scribd.com/doc/26707268/OAuth-Echo-Identity-Veri%EF%AC%81cation-Delegation-Draft>
[3] TwitPic Developers - API Documentation ( 版) <http://web.archive.org/web/20140701155155/http://dev.twitpic.com/docs/>
[4] OAuth Echoを調べたのでメモ - BangBlog ( 版) <http://bang.hateblo.jp/entry/20101127/1290883965>