The most common citation styles are:
Zotero is free, cross-platform software that is used to collect your research in one place. Zotero not only collects citations, but also PDFs of full text articles when possible. It allows grouping of research into searchable collections while adding your own notes and tags. It can then export a bibliography in a variety of styles for your research paper!
Learn more about this citation management tool, including how to download it to your device in the library's Zotero guide.