Prefer the hackerly style of quotation punctuation: the period ends the sentence:<p>> Dr. Johnson kicked a large rock and said, as his foot rebounded, “I refute it thus”.<p>This is one big sentence which contains an embedded quote. The period ends that big sentence.<p>The quote contains a complete sentence. Therefore, arguably, it deserves its own period.<p>> Dr. Johnson kicked a large rock and said, as his foot rebounded, “I refute it thus.”.<p>So this matter revolves around the idea that we want only one period, and so the question is which of these two periods do we elide.<p>I'm arguing that if we are going to elide, the one we should elide is the inner one, because it's of less importance. Eliding the outer one leaves the entire sentence unterminated, whereas the quote is obviously terminated by the closing quote.<p>(What is the sentence period for? It's for indicating where sentences end, so that the reader doesn't get confused parsing the end of one sentence together with the start of the next one. A closing quote has a solid end indicator already.)<p>If there are multiple quoted sentences, then those except the last preserve their terminating punctuator:<p>> Dr. Johnson kicked a large rock and said, as his foot rebounded, “How shall I refute it? Ah, I refute it thus”.<p>What if the quoted sentence ends in a terminator different from the one of the embedding clause? Then we cannot elide either one:<p>> Dr. Johnson kicked a large rock and said, as his foot rebounded, “How shall I refute it?”.<p>Except if the inner one is a period. We can establish the convention that a missing punctuator inside a quote is an implied period (if the quote is obviously a complete clause):<p>> Did Dr. Johnson really say “I refute it thus”?<p>Something like that. We should strive, in some halfway rational way, not to leave the overall sentence without terminating punctuation.<p>(I do not agree that .". has a <i>redundant</i> period. Two different sentences are ending, using their own punctuation marks which are not related, and could potentially be different. I agree that it's ugly. Eliding the inner period is not the same as eliminating it; we are making it <i>implied</i>. Something implied is still semantically there, just not as a visible syntactic token.)<p>Note that whatever." does not indicate the end of a sentence; it can plausibly continue:<p>> Dr. Johnson said "I refute it thus." and kicked the rock.<p>As soon as we have additional words after the quote, we have two periods unless we elide one. In this case, we definitely must not elide the one after "rock". Whereas eliding the quoted one according to the hackerly style leaves a clean result:<p>> Dr. Johnson said "I refute it thus" and kicked the rock.