@Book{Zittel1877,
author  = "Zittel, Karl Alfred von",
title   = "Studien über fossile Spongien. Hexactinellidae",
year    = "1877",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 13, Abth. 1 = [1]",
url     = "https://publikationen.badw.de/en/003796863",
}