[1] Developer's Guide: Protocol - Google Contacts Data API - Google Code (2010-08-17 20:48:27 +09:00 版) <http://code.google.com/intl/ja/apis/contacts/docs/3.0/developers_guide_protocol.html>

[2] AuthSub for Web Applications - Authentication and Authorization for Google APIs - Google Code (2010-12-27 18:20:50 +09:00 版) <http://code.google.com/intl/ja/apis/accounts/docs/AuthSub.html>

[3] AuthSub for Web Applications - Google Accounts Authentication and Authorization — Google Developers ( (2012-06-26 17:03:31 +09:00 版)) <https://developers.google.com/accounts/docs/AuthSub>