Combining references and footnotes

I'm writing a book and the publisher is insisting that our footnotes (i.e. not references, but elaborations on particular points) are integrated into our reference list at the end of each chapter:
e.g.
1. Smith P. Wonderful Work. London, 1990.
2. We accept that this definition misses out the important issues of X and Y, but we pick this up again in Chapter 8.

I can't find a means of doing this. Any help would be much appreciated!
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