Zotero is a great tool to manage citations. It can also help organize information and facilitate collaboration when working on a group project.
Don't have Zotero installed? Follow these instructions in the Quick Guide
Adding and sharing citations when working in a group
Tagging adds a search term to an entry. You can search on a tag to display a group of article with the same tag. Suggested tags:
Creating theme folders is another way to group articles that have a specific theme.
Organize your research with Zotero - quick reference guide to organizing your research in Zotero
When you collect and organize your references/citations with Zotero, you can then use Zotero to format your bibliography and a Zotero Word plugin to "cite while you write."