Zotero is a research tool that falls into the category of reference management software that includes EndNote, Mendeley, and RefWorks.
Zotero is free, and open source. It works with Firefox, Chrome, and Safari browsers to download and record citation information, and full-text from websites and databases such as Academic Search Ultimate. It allows you to organize your research in folders, add tags and notes, and create in-text citations and bibliographies within Word and LibreOffice with its cite while you write features. It is easy to use, and saves time while improving the process of managing and using your research.
Purdue OWL has guides to the big three citations styles (APA, MLA, and Chicago) that will help you cite any source correctly.
If you have any questions about Zotero or citing sources, be sure to contact me or any other librarian!