Although the Biblio module can create reference lists on its own, it can also work in conjunction with the Footnotes module which will allow you to intermingle Footnotes [fn] and Biblio [bib] tags in the same document and have them sequentially numbered.

There is a little configuration required to get it to work, but the following steps should be all that is required...

1. On the admin/settings/biblio page in the "Footnotes" section, enable "Integration with the footnotes module"
2. You need to edit each of your input formats (admin/settings/filters) and click the configure link and enable both "Footnotes [fn]...[/fn]" and "Biblio module references or [bib]" option for each of the input formats that you use.
3. Make sure that the above mentioned "Biblio module references or [bib]" option is listed ABOVE the "Footnotes [fn]...[/fn]" option, and if it isn't, click the "Rearrange" button at the top of the page to rearrange them so that Biblio is above Footnotes.
4. Create/edit your page or article in which you want to include a biblio footnote, and add the footnote to the text like this... "This is a test of [bib]16389[/bib] and [bib]16390[/bib]" where the text between the [bib] tags represents a "citekey" from a biblio entry which has already been created.
5. Set the input format of the page or article you are editing to be one that you modified in step 2 which now includes [bib] tags and save your article.