The Rise of "Logical Punctuation".

"The period outside the quotation marks is not a copy error."

http://www.slate.com/id/2293056/

""Tales of the City" and "Out in the Silence" are units—consisting of the words and the quotation marks. Insinuating a period or comma within the unit alters it in a rather underhanded manner. American style is inconsistent, moreover, because when it comes to other punctuation marks—semicolons, colons, exclamation points, question marks, dashes—we follow British/logical protocol. Dean Hamer would pass muster in any U.S. newspaper or magazine, for example, if he were to write: I am a big fan of "Tales of the City"; did anyone else see "Ask Not"?"