Starnawska, M. “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, vol. 21, May 2017, pp. 223-8, doi:10.12775/OM.2016.011.