@Book{Spengel1868,
author  = "Spengel, Leonhard",
title   = "Aristotelische Studien. Zur Politik und Oekonomik",
year    = "1868",
address = "München",
series  = "Abhandlungen",
volume  = "11,3",
url     = "https://publikationen.badw.de/de/003832533",
}