?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=+Engel+Joachim&rft.aufirst=Joachim&rft.aulast=Engel&rft.date=2018&rft.isbn=978-963-306-575-4&rft.title=Exploring+civic+statistics+with+CODAP&rft.genre=proceeding