APA Style (7th ed.)

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Sometimes you need to go into more detail about one particular source. Putting an in-text citation after every sentence that comes from that source doesn’t look great and breaks the flow of your writing, but leaving the in-text citations out risks plagiarism. So, introduce the source early in the paragraph, with the author as part of the sentence rather than in brackets:

For the rest of the paragraph, you can refer back to the author by name or pronoun when elaborating on their ideas:

To indicate that the ideas in a new sentence come from the same material as the previous sentence, phrases such as the following should be added such as:

If it is clear to the reader that all the ideas come from that same source, there is no risk of plagiarism and the paragraph flows well.