It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
All three of the famous cases of unintentional plagiarism referenced on the previous page could have been avoided if the authors correctly cited their sources. You can avoid unintentional plagiarism in your own work by:
Understanding the principles of when you must cite
Getting in the habit of including quotation marks, page numbers, and other citation information during the research process, especially when cutting and pasting from online sources
Using a consistent citation style
Employing citation software to help keep track of your sources