Most properly authored ebooks have a backlink to the original reference. If that's the case here, and you know which of the footnotes you followed the reference for, you can click that.
On Nook STR, there's a 'Back' button to take you back (as long as you don't advance the page before attempting this). I think NookColor has the same feature, but different implementation: swipe from right to left on status bar. Hopefully someone else can confirm this, I don't have a NC.
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