Although some students probably intend to plagiarise, others do it unintentionally; yet, as McGowan observes, "unwitting plagiarism" has been "largely neglected in the literature" (2005). In this article, I discuss some practices of attribution that students bring from school to university, and focus on one kind of 'unwitting plagiarism' that puzzles lecturers and student learning advisers alike - that is, when students provide a reference for 'clearly' plagiarised material. Drawing on Bakhtin, I suggest reasons why this practice makes sense to the students who do it. Then, drawing on Rose (1996) and East (2006), I look at the kind of teaching that would be necessary to mediate the gap between students' and lecturers' understandings of the purposes of attribution in scholarly writing.