[1] [CITE[OAuth Echo | Twitter Developers]]
([TIME[2015-03-05 11:41:22 +09:00]] 版)
<https://dev.twitter.com/oauth/echo>

[2] [CITE@en[OAuth Echo - Identity Verification Delegation (Draft]]
([TIME[2015-03-05 11:45:38 +09:00]] 版)
<http://ja.scribd.com/doc/26707268/OAuth-Echo-Identity-Veri%EF%AC%81cation-Delegation-Draft>

[3] [CITE@en[TwitPic Developers - API Documentation]]
([TIME[2015-03-05 11:49:49 +09:00]] 版)
<http://web.archive.org/web/20140701155155/http://dev.twitpic.com/docs/>

[4] [CITE@ja[OAuth Echoを調べたのでメモ - BangBlog]]
([TIME[2015-03-13 09:12:18 +09:00]] 版)
<http://bang.hateblo.jp/entry/20101127/1290883965>