cite.el is a small citation package.
Download: Lisp:cite.el
Or: http://purl.org/NET/wence/cite.el – Author’s page.
Put cite.el in your load-path and add the following to your .emacs file:
(require 'cite)
When you use Gnus:
(add-hook 'message-cite-function 'cite-cite)
When you use another mailer like ViewMail oder WanderLust:
(add-hook 'mail-citation-hook 'cite-cite)