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The link you provided clearly specifies a recursive example of quicksort. Also it says that "Quicksort can operate in-place" which implies that it does not have to be in-place.
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Quicksort 2 - Sorting
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The link you provided clearly specifies a recursive example of quicksort. Also it says that "Quicksort can operate in-place" which implies that it does not have to be in-place.