# Layout issue with biblatex

On the screenshot you can see that the ISBN number breaks the layout:

How can I fix the layout?

On my small attatched example the layout is not so much demaged like in my real work but you will see also the problem.

\documentclass[
a4paper,
12pt,
bibtotoc,
liststotoc,
]{scrreprt}

\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[utf8]{inputenc}
\usepackage[english, ngerman]{babel}
\usepackage[backend=bibtex, natbib=true, citestyle=alphabetic, bibstyle=alphabetic]{biblatex}

\bibliography{source}

\begin{document}
\chapter{Intro}
Some info \cite{Hoehne2010}

\printbibliography
\end{document}


And my bibtex file:

@BOOK{Hoehne2010,
title = {Verfahren zur Anonymisierung von Einzeldaten},
publisher = {Statistisches Bundesamt},
year = {2010},
author = {Höhne, Jörg},
series = {Statistik und Wissenschaft, Teil 16},
isbn = {9783824609017},
type = {text},
url = {http://www.destatis.de}
}

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Long strings in bibliographies often give problems in line breaking. A "cheap" solution in this case is to use the hyphened form of the ISBN number:

978-3-8246-0901-7


This is the "official" style: the first group corresponds to "book publishing", the second is the language (3 is German); then come the publisher and the title; the last one is the check digit.

See here for a reference for this particular book. You can also check at the ISBN organization converter

Note: rekire has pointed me to another online resource:

http://toolserver.org/isbn/IsbnCheckAndFormat

that is also able to check with some databases for the corresponding book.

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