In order to add references found in EbscoHost, it is necessary to use the Export feature.
When conducting a search, click the Add to Folder in each item record. This will save your chosen articles to a Folder, which can be accessed at the top of the page.
Once you have finished saving your desired items to the Folder, click the Folder link at the top of the page. Click Select All References and then click Export. This will save your Ebsco citations to your Zotero library.