Each instance of quoted or paraphrased information within a paragraph needs a citation. ... Failing to make it clear which information within a paragraph came from another source could be considered plagiarism, so please make sure that you give credit where it is required.

How many citations should be in a paragraph?

Including just one citation at the end of a paragraph is not sufficient unless the last sentence is the only information in the paragraph that came from the cited source. Cite sources often and correctly throughout a paragraph in order to avoid unintentional plagiarism.

Do I have to put a citation after every sentence?

No. The citation should appear only after the final sentence of the paraphrase. If, however, it will be unclear to your reader where your source's idea begins, include the author of the source in your prose rather than in a parenthetical citation. For example, the following is a paraphrase from an essay by Naomi S.