MIT - Avoiding Plagiarism in Paraphrasing
Plagiarism Spectrum by turnitin.com. This survey from turnitin.com provides a lot of insight into how instructors across the country categorize types of plagiarism, and includes their ratings of the seriousness of each type. The examples provided could serve as a lesson on the topic for your students.
Plagiarism Quiz by Turnitin.com. This quiz from turnitin.com provides students an opportunity to see different instances, nuances, and consequences of plagiarism. The quiz provides feedback commentary for both correct and incorrect answers.