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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 –  Shredder 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. –  Shredder 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? –  Shredder 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

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