Starnawska, Maria. “Darius Von Güttner-Sporzyński, Poland, Holy War and the Piast Monarchy, 1100–1230 (Europa Sacra 14), Brepols, Turnohout 2014, XII + 294 Pp. + Maps, ISBN: 978-2-503-54794-7”. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders 21 (May 9, 2017): 223–228. Accessed July 23, 2024. https://apcz.umk.pl/OM/article/view/OM.2016.011.