# [Tex/LaTex] Reduce font size of bibliography; overfull bibliography

biblatexfontsize

I am using Biber (backend of biblatex) to make the bibliography. I have two questions about the bibliography.

1. 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. [1], [2] etc.). In particular, the font of my text is 11 pt and I want to print the bibliography in 10 pt.

2. 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 hbox?

\renewcommand*{\bibfont}{\small}