http://www.academia.edu/1045395/%C5%9Awi%C4%99tos%C5%82awa_Sygryda_Gunhilda._To%...

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http://www.academia.edu/1045395/%C5%9Awi%C4%99tos%C5%82awa_Sygryda_Gunhilda._To%C5%BCsamo%C5%9B%C4%87_c%C3%B3rki_Mieszka_I_i_jej_skandynawskie_zwi%C4%85zki_%C5%9Awi%C4%99tos%C5%82awa_Sygryda_Gunhilda._The_identity_of_Mieszko_Is_daughter_and_her_Scandinavian_relationships. Cited by Cited by Wikipedia. Estrid Svendsdatter of Denmark Accessed June 14, 2017. jhd

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