I'm aware that periods should be put inside of quotes, as in this example:
The woman told me that I need to "do something useful with my life."

But I hadn't previously thought that commas belonged inside of quotes. I began to wonder about this while reading Walter Kaufmann's translation of Nietzsche's "Beyond Good and Evil" - he frequently uses them as in the following example:
And then the man said "sit down," and so I sat.

I'd previously thought that the following would be correct:
And then the man said "sit down", and so I sat.

Is one of these ways simply wrong, or are both correct?
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Comments  (Page 2) 
In the US, the second one.
Hi there, I wonder if you could help me? I've worked in the advertising business for too long to remember and have always been taught that indeed "sit down," is correct. However, in this all new world we live in, I'm having constant battles with our 'Sub-editor' and some clients who claim that "sit down", is correct.
On a personal note...I want to scream at the top of my voice and kick these people out of the building...but on a professional note...I'm seeking any references I can put in front of people to once and for all, put the issue to bed.
Sorry for the rant, but the question is...do you know anywhere I can reference (other than here) which endorses the correct usage?
many thanks for any assistance.
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Tony, if you're in the U.S. then periods and commas always go inside the quotation marks, regardless of the logic.

See any of these: http://www.google.com/search?q=comma+inside+quotation+marks&hl=en&sourceid=gd&rlz=1Q1GZAZ_enUS366...
if you're in the US, commas and periods go inside the quotes, even if you're not talking about speech. For instance, he's currently reading the book "Of Mice and Men." People get this wrong all the time.
In the following quote, "The question is, " said Humpty Dumpty... I noticed an extra space between the opening quote and "said." Is the spacing here significant?

Thank you.

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My guess is, typographical error. There is no significance to the spaces.
If the question is the thread title, "Should a 15 yr old who committed premeditated murder be tried as an adult?" then the answer is no.

My 2 cents.
Surely the woman told you that you needed to "do something useful with your life", otherwise it wouldn't be a quote but merely your relating of the gist of what she said to you?
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Rule 1.Periods and commas always go inside quotation marks, even inside single quotes. http://www.grammarbook.com/punctuation/quotes.asp
Examples:The sign changed from "Walk," to "Don't Walk," to "Walk" again within 30 seconds.
She said, "Hurry up."
She said, "He said, 'Hurry up.'"