Academic integrity or practicing the ethical use of information is a construct of western culture. You may have students in your class who do not understand the American values associated with plagiarism. Here are some resources to help you explain this concept.
From the Mentor, an academic advising journal from Penn State, Division of Undergraduate Studies. The section on Cultural Issues to Consider....provides information about different cultures and academic integrity.
Ten questions you can use for a classroom discussion about plagiarism.