cites for blockquotes

[Aaron Swartz]

>> I am wondering how such a quote should be rendered to be correct
>> (regardless of Markdown’s abilities for the moment). I always thought
>> the attribution should be indented or right aligned.
>
> I think it's a matter of taste. There's no established "correct" way
> to typeset an attribution like that. Indented and right-aligned are
> common, though.

Bringhurst 5.2.3 implies that the correct way to do it is an em-dash 
followed by an M/5 (thin) space.

-- 
Aaron Swartz: http://www.aaronsw.com/