Well now, I just walked over to the proofreaders and borrowed the Chicago Manual of Style (that should have been underlined). "The British style of positioning periods and commas in relation to the closing quotation mark is based on the same logic that in the American system governs the placement of question marks and exclamation points: if they belong to the quoted material, they are placed within the closing quotation mark; if they belong to the including sentence as a whole, they are placed after the quotation mark. The British style is strongly advocated by some American language experts." That's in section 5.13, if you're interested.

-Faux "Strunk" Pas