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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A look inside
manmac.tex, which is some macros for The famous TeXbook, reveals the definition of
--- (EM-Dash) for quotes.
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