@Book{Prutz1915,
author  = "Prutz, Hans",
title   = "Die Friedensidee im Mittelalter. Vorgetragen am 9. Januar 1915",
year    = "1915",
address = "München",
series  = "Sitzungsberichte",
volume  = "1915,1",
url     = "https://publikationen.badw.de/en/008940236",
}