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Eliminate the FIRST citation, it doesn't make a difference that it is quoted. You have a single sentence, the second [3] is enough for the whole sentence. Further, you do not need to quote the fi...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/39692 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/39692 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Eliminate the FIRST citation, it doesn't make a difference that it is quoted. You have a single sentence, the second [3] is enough for the whole sentence. Further, you do not need to quote the first part, it is a statement of fact not an opinion you need to distance yourself from. If you decide to break this into two consecutive sentences, then you cite the first [3], and the second [ibid]. "ibid" means in the same (last cited) source; it is proper even though it takes up more space than [3]. If the sentences are NOT consecutive, and are separated by your own prose, then cite them both as [3].