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If you are quoting already-quoted words (e.g. when the book you are reading quotes an ancient source), do not pretend that you were reading the original source, but describe it, and indicate that it was “cited by” or “translated by” [place where you read it]. See Section 8.4.9 .
Notes are to be indicated in the text by a superscript numeral. Where practicable, the numeral should be placed at the end of the sentence (after the final punctuation) rather than after the first word to which it applies in the text.
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