Punctuation of a Direct Quote [closed]

Is any particular punctuation necessary when a quotation is the subject of a sentence? For example, in the sentence below, should there be a comma after export? Or anything else?

"Laughter is America's most important export" is a well-known quote of Walt Disney's.


Solution 1:

I do not see a problem with that.

"Yields falsehood when preceeded by its quotation" yields falsehood when preceeded by its quotation.