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How should I punctuate around quotes?

If I am quoting someone in my writing, and I end their quote with a period, and the end of the quote is also the end of my sentence. How do I properly end the sentence? An example of this is in my last question:

For example, "The file is not updat(e)able.".

Here is another example:

The boss said, "If you don't get your work in by tomorrow, you're fired.".

Is that how you properly end the sentence, or should I leave one of the periods out? If the latter, could you explain why?

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marked as duplicate by Gnawme, aedia λ, Mahnax, Will Hunting, Hellion Jan 31 '12 at 4:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Are you trying to write in American English or UK English? –  David Schwartz Jan 31 '12 at 0:47
@DavidSchwartz American English –  Nick Rolando Jan 31 '12 at 1:06
I don't really see how this is a duplicate. It's related, but the other post doesn't answer my question as to ending sentences. –  Nick Rolando Jan 31 '12 at 17:44

1 Answer 1

up vote 2 down vote accepted

For standard American English, omit the period at the end of the sentence and leave the one inside the quotation.

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Thanks. Is there an explanation for this, or can you point me to some kind of resource? –  Nick Rolando Jan 31 '12 at 1:31
It comes from old mechanical typesetting systems. The close quote is lower on the left hand side, making less space when the punctuation mark is to the left of it. –  David Schwartz Jan 31 '12 at 1:36
The confusion is probably because periods need to come after parentheses (because writing in parentheses is technically not part of the sentence). You should be able to take away parenthetical text without causing an error, so if you were to put a period within the parentheses (like this.), the sentence would technically not have an end. –  Adrian W Mar 14 at 5:56

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