@Book{Heisenberg1926,
author  = "Heisenberg, August",
title   = "Das Kreuzreliquiar der Reichenau. Vorgetr. am 13. Juni 1925",
year    = "1926",
address = "München",
series  = "Sitzungsberichte",
volume  = "1926,1",
url     = "https://publikationen.badw.de/de/008940120",
}