Council of Writing Program Administrators - Statement on Best Practices - From their website: This statement responds to the growing educational concerns about plagiarism in four ways: by defining plagiarism; by suggesting some of the causes of plagiarism; by proposing a set of responsibilities (for students, teachers, and administrators) to address the problem of plagiarism; and by recommending a set of practices for teaching and learning that can significantly reduce the likelihood of plagiarism.
International Center for Academic Integrity - Endeavors to cultivate a culture of academic integrity in communities across the world.
Purdue OWL - Avoiding Plagiarism - The Purdue Online Writing Lab provides a definition of plagiarism, an exercise for use with students, and best practices for teachers.