Dealing with plagiarism

https://writinglabnewsletter.org/archives/v21/21-6.pdf

So far I have only ran into two students with plagiarism issues. One in which had to rewrite his entire summery because it was almost entirely word for word from his book. He had no idea that his paper was plagiarized. Since it was also a summery it should not have had any direct quotes in the first place. I definitely think the language barrier played a role in this incident because he clearly was confused on what plagiarism even was when I asked him about it. The second one had plagiarism issues because he just did not understand how to cite his sources.