?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Van+der+Kerken%2C+Georges&rft.aulast=Van+der+Kerken&rft.aufirst=Georges&rft.date=1920&rft.btitle=Les+societies+bantoues+du+Congo+belge+et+les+probl%C3%A8mes+de+la+politique+indig%C3%A8ne&rft.genre=book