Freza‑Olczyk, Mariola. „Stepmother and Stepson: Duchess Matilda in the Power Struggle After the Death of Her Husband Barnim I, the Duke of Pomerania”. Studia Z Dziejów Średniowiecza, nr 23, grudzień 2019, s. 83-99, doi:10.26881/sds.2019.23.03.