I am using Biber (backend of
biblatex) to make the bibliography. I have two questions about the bibliography.
I want to use a reduced font ONLY for the bibliography (not the citation in the text, that in my text is in numeric style e.g. ,  etc.). In particular, the font of my text is 11 pt and I want to print the bibliography in 10 pt.
In the bibliography some text exceeds the text cage, because the ISBN is printed without a break. What is the command I should use for avoid this overfull