Here are a variety of resources that help with citing sources. The citation format for your research paper depends on what is required by your professor. Know the requirements before you begin constructing your bibliography and end notes.
When searching in the PSU Library catalog, you can find a citation generator for MLA, APA, or the Chicago Manual of Style under each tab by selecting Send to then Citation.
The PSU Writing Center has a great information on when and how to cite your sources.