Google recently added “citations”  under the tool drop down. Using this feature will eliminate the back and forth between tabs  and addons in order to access a citation generator such as EasyBib. Below is an easy to follow tutorial by Richard Byrne of Free Technology for Teachers on how to use the citations feature in Google Docs.

You can see his post in its entirety HERE. 
 

If you do not like the Google Docs citation generator here is a list of others you can try:

 

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