Nielsen, T K & Jensen, K V 2023, The Prussian Crusade and the Teutonic Knights . in J Phillips, A Jotischky, C Gaposchkin & T Madden (eds), The Cambridge History of the Crusades . vol. 2, Cambridge .
Nielsen, T K & Jensen, K V 2023, Crusading in the North . in J Phillips, A Jotischky, T Madden & C Gaposchkin (eds), The Cambridge History of the Crusades I-II . vol. 2, Cambridge University Press, Cambridge .