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As a typesetter, I would put the number after the period, no space, and then superscript it: this is a sentence taken from someone.[2] I feel like this is the most visually pleasing, since th...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/20555 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20555 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As a typesetter, I would put the number after the period, no space, and then superscript it: > this is a sentence taken from someone.<sup>[2]</sup> I feel like this is the most visually pleasing, since the footnote is snugged up to the period, doesn't leave ugly white space under it, and is smaller so it doesn't draw so much attention to itself. Whether this is correct in terms of various style guides I have no idea.