Zotero facilitates the management and formatting of citations. However, like other citation management software tools, it is vital that you check the citation data at the import stage, the formatting of your in-text citations, and the generated bibliography to ensure the completeness and accuracy of the data captured or the references being produced. Sometimes, if there were entry errors for your resources' metadata, those same errors could be replicated in your in-text citations and/or bibliographies.
References found in a database can be exported (or saved) to a file and then imported into Zotero.