400. That’s an error.

Google cannot redirect you to http://www.boekenbron.nl/boek/riet-nora-van/groepswerk-in-het-maatschappelijk-werk-9789023237273/?utm_source=googlebooks&utm_medium=cpc&utm_campaign=googlebooks because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.