1. create your latex frame, and include your bibliography stuff at the end of the document as you would for a normal document. i.e.
\bibliographystyle{abbrv}
\bibliography{refer}
2. Find out what the current temporary filename scribus is using for rendering is. It will be mentioned in the 'Program Messages' listing. The file will be in the $TEMP directory.
3. Jump into that directory and copy your bib file into the $TEMP directory.
4. Run bibtex on the temporary filename.
5. Run latex again, and again, using the 'Update' button on the Editor dialogue.
