You can add Cite While You Write to Google Docs. Go to the Google Marketplace to install: CWYW for Google
Once you open a new Google doc follow these step:
To download the Cite While You Write tool for Word you must first create an EndNote Online Account. Go to the EndNote Online (Cloud) tab for instructions on creating an online account. After you have created an EndNote Online account go to Downloads on the navigation toolbar and follow the download instructions for Cite While You Write (CWYW).
Once you are ready to insert citations into your Word document place your cursor in the body of text, where the citation should be inserted. You have two options: Insert Citation or Go to EndNote:
Option 1: Insert Citation
Option 2: Go to EndNote
You can change the reference style before or after inserting citations.