Open up a document in Google Drive
Click on "Tools" and select "Explore"
Use the new search window that opens on the right and search Google
The results are active links to websites, and if you select "quotes" icon Google Docs inserts MLA or APA citations directly to your Google Doc.
EasyBib
The Free MLA Automatic Bibliography and Citation Generator
http://www.easybib.com/
bibme
The Free APA Automatic Bibliography and Citation Generator
http://www.bibme.org/apa
Citation Maker
Create a Works Cited or Reference list of research sources following the MLA and APA standard citation formats.
http://secondary.educator.oslis.org/cite-sources