@Book{Zittel1878,
author  = "Zittel, Karl Alfred von",
title   = "Studien über fossile Spongien. Monactinellidae, Tetractinellidae und Calcispongiae",
year    = "1878",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 13, Abth. 2 = [4]",
url     = "https://publikationen.badw.de/en/003796866",
}