Citing isn't the only ethical thing you need to think about when creating your presentations. Copyright is also an issue. When you're just quoting a section of a work for an educational project it probaby falls under fair use. But if you're reproducing a lot more of a work, then you need to think about copyright. See the guides below for more information!
Copyright is a form of property which is derived from The U.S. Constitution, Article I, Section 8, Clause 8 of the United States Constitution: "To promote the Progress of Science and useful Arts, by Securing for Limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries" and which protects original works of authorship. The author owns the work she or she creates; and the author has the sole right to copy, distribute, adapt, display, or perform the work (unless the author gives the right to someone else). Copyright exists from the moment the work becomes a fixed medium of expression (written, recorded, performed, etc). No formal registration is required. As of 1989, the copyright symbol is no longer needed nor is formal registration with the Library of Congress to retain rights to copyrighted works.
For details on fair use of copyrighted content, visit our Fair Use page.
You might also check out a 4 minute video on copyright and fair use on Lynda.com. (Log in using your W&M credentials.)