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In your code you have a renewenvironment for thebibliography. look at the start, there you see the section. Replace it and the mark commands with the ones you are using at the very end.

Johannes, thanks a million! I've spent way too much time on this ... certainly should have asked the crowd ...

Dear all,

I am having trouble suppressing the automatically appearing "Reference" title using bibtex in the book article class/ environment. Instead, I want to use \chapter*{Bibliography} (which I also add to the TOC) to have the heading in the same style as other chapters in the book, as you can ...