https://www.zotero.org/ is freeware available to download online, and allows you to store all your citations in one place, and then makes it easier to include them in your research papers. Frankly, it's kind of like magic - really really helpful magic!
The screenshots below are another option to walk you through getting started with Zotero - in this case, using Chrome on a Macbook.
If you prefer video, this 9-minute one walks you through the steps - from downloading Zotero, to adding your citations (either manually or direct from library databases), to adding them to your Word or Google documents (both in-text citations/footnotes/endnotes & the bibliography/works cited list). This Zotero LibGuide includes shorter videos of each step of the process and covers additional features as well.