Zotero is a free citation management program that helps you collect and organize your research information.
It can help you build personal library of source information from articles, books, documents, web pages, and more. This personal library of sources can work with your word processing tool to format a paper in your choice of style.
Includes browser extensions for Google Chrome, Firefox, Safari, and Word Processor plugins for Microsoft Word on Mac and Windows, LibreOffice, and Google docs (new!).
For Google Docs, no installation is needed - a Zotero menu is already included. Use the preferences option to link to an existing Zotero account.
A toolbar button is also included for a one-click citing option:
Option 1: Enter manually
Option 2: Direct Export from your favorite database (in general)