Keeping track of research can be challenging and while OneDrive, GoogleDrive, email, or a notebook can help, sometimes a citation management tool can make it easier to stay organized. Linked below are two popular options that offer free basic accounts you might want to investigate-

• Zotero (integrates with GoogleDoc, Word, offers an app and browser extension, unlimited groups for collaboration, open source)
• Mendeley (Integrates with Word, offers an app and browser extension, free version allows 5 groups, owned by Elsevier)