Starnawska, M. (2017). 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, 223–228. https://doi.org/10.12775/OM.2016.011