Citation is your indication that certain material in your work came from another source. It also provides readers with the information necessary to find that source again. Giving credit to the original author by citing sources is the only way to use other people's work without plagiarizing.
The following situations almost always require citation:
Adapted from: Plagiarism.org
Here are some great resources to help with proper citation styles:
For detailed information on how to use NoodleTools, please see the library's NoodleTools Research & Citation Manager research guide.