Bruyn, J.M. de. “J. Offermans, De Abdij Kloosterrade - Rolduc (1104-1830)”. BMGN - Low Countries Historical Review 120, no. 2 (January 1, 2005): 273–274. Accessed February 24, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107107.