Academic work represents not only what we have learned about a subject but also how we have learned it. Electronic sources, such as found in the Internet or on the World Wide Web, must also be cited. These are the methods of scholars, adopted so that others may trace our footsteps, verify what we have learned, and build upon our work, and all members of the academic community are expected to meet these obligations of scholarship. When in doubt, cite. Failure to acknowledge sources is plagiarism, regardless of intention.
Academic integrity extends beyond the submission of academic work.
A full discussion of the Code of Academic Integrity and the measures for its enforcement can be found in the The Pennbook. Since many graduate and professional schools specifically request information about a student's academic honesty, a violation of the Code of Academic Integrity can have major consequences. The best strategy is to avoid situations where academic dishonesty might occur.