@Book{Prutz1918,
author  = "Prutz, Hans",
title   = "Kurlands deutsche Vergangenheit. Vorgelegt am 12. Januar 1918",
year    = "1918",
address = "München",
series  = "Sitzungsberichte",
volume  = "1918,1",
url     = "https://publikationen.badw.de/de/008048612",
}