@Book{Ritter1871,
author  = "Ritter, Moriz [Sonst.]",
title   = "Quellenbeiträge zur Geschichte König Heinrichs IV.",
year    = "1871",
address = "München",
series  = "Sitzungsberichte",
volume  = "1871,19",
url     = "https://publikationen.badw.de/de/007457756",
}