@Book{Prutz1916,
author  = "Prutz, Hans",
title   = "Der Kampf um die Leibeigenschaft in Livland",
year    = "1916",
address = "München",
series  = "Sitzungsberichte",
volume  = "1916,1",
url     = "https://publikationen.badw.de/de/008048605",
}