Sure you can share, publish, work collaborative, BUT did you know you can also research and cite sources right from within Google Docs?
With a Google Doc open, go to the Tools menu and select Research:
You get a Research side bar where you can choose what type of resource you want to search for:
Even better you get to pick the type of resource: "Free to use" or Not and the type of citation format: APA, MLA, and Chicago:
You can Preview, Cite, or Insert links directly into your document. And Google handles the footnote/bibliography for you!