Schwennicke, Detlev, ed., Europaische Stammtafeln: Stammtafeln zur Geschichte der europaischen Staaten, New Series. XIX: Zwischen Weser und Oder. Frankfurt am Main: Vittorio Klostermann, 2000. Information from this source tagged as [Ref: ES XIX #[0-9]*].
Sources for birth and parent Information
father:
dotted line to Gebhard I Count of Querfurt [Ref: ES XIX #82]
Sources with Information about marriage to Oda Of Nordmark
child:
[Ref: ES XIX #82]
Research Notes:
Count, place not given [Ref: ES XIX #82]