# What kind of dash is used before a quote attribution?

In this quote example:

“Planning your video is the first step.” -Christine Cloud, Producer

Should the name be preceded by an em dash, or a swung dash?

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I shouldn't use swung dash (~) at all.

According to grammarbook.com, the Em Dash should be preferable for a more informal writing in English language. The Em Dash is used (among other cases) to separate phrases.

In any case, I'd rather use:

“Planning your video is the first step.” Christine Cloud, Producer

but this could also be chosen:

“Planning your video is the first step.” —Christine Cloud, Producer

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Thank you, looks good. If they want to break it onto two lines, is it okay to start a line with the em dash? –  Dennis Donovan May 17 '12 at 19:39
A look inside manmac.tex, which is some macros for The famous TeXbook, reveals the definition of \author:
\def\author#1(#2){\smallskip\noindent\rm--- #1\unskip\enspace(#2)}

which uses --- (EM-Dash) for quotes.