Ingebjørg Einarsdatter Tambarskjelve - Sources?

What are the Sources for Ingebjørg Ingebjørg Einarsdatter Tambarskjelve the wife of Halvdan Sigurdsson av Stein & mother of Bergljót Thorbjórg Hálfdansdóttir Finn ?

Cawley gets this far with Sources:HALFDAN Sigurdsson. Snorre names "Guthorm, the eldest, then Gunhild, the next Halfdan, Ingerid and Harald" as the children of Sigurd & his wife[295]. Morkinskinna names (in order) “Gudrødr…Hálfdan…Ingibjorg…Gunnhildr, Haraldr” as the children of “Sigurdr sýr” and his wife “Ásta daughter of Gudbrandr”[296]. m ---. The name of Halfdan's wife is not known. Halfdan & his wife had one child:
(a) THORBERG [Bergliot] Halfdansdatter ([1018/20-). http://fmg.ac/Projects/MedLands/NORWAY.htm#ThorbergHalfdansdMFinArn...

Are there other Sources? None are indicated here.

cf https://www.geni.com/discussions/112371?msg=1573186