You cite the database that the full text is retrieved from, not the one originally searched.
For example, if you were searching EBSCOhost, and were directed through to ABI Inform for the full- text, you would say Retrieved from ABI INform.
1. If there is a DOI, use this.
2. If there is no DOI, use the name of the database the article comes from. This will be the specific database, and it is often named in the detailed record, e.g. in the example below, the retrieval statement would be: Retrieved from SocINDEX database.
3. If there is no DOI and no database is named, use the URL of the publisher. You will need to find this on Google.