@Book{Spengel1855,
author  = "Spengel, Leonhard",
title   = "Isokrates und Platon",
year    = "1855",
address = "München",
series  = "Abhandlungen",
volume  = "7,13 . 3. Abth.",
url     = "https://publikationen.badw.de/de/008531490",
}