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Try something like this: This quote is often attributed to Carl Sagan, but I can find little evidence to support that attribution. Regardless, I think this quote is important because...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6179 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/