To learn more about your responsibility to cite sources, visit the library's Academic Integrity Portal. In short: if you used it, you should cite it.
Various standards have been created for citing sources, including MLA (Modern Language Association), APA (American Psychological Association), and Chicago formats. Specifc professions may adopt their own styles. Please note that standards for citing electronic information are still evolving; many print and electronic style guides may appear to be inconsistent in their instructions.