The teutonic order in Prussia and Livonia: the political and ecclesiastical structures 13th-16th C. - Czaja, Roman; Radzimiński, Andrzej; Arszyńsjki, Marian; Arnold, Udo (Towarzystwo Naukowe w Toruniu, 2015)
"To Prof. Dr. Dr. h.c. mult. Udo Arnold on his 75th birthday"
This book contains several essays by Polish and German historians and art historians from the Nicolaus Copernicus University in Toruń, translated into English