@book { ZeitWertGeld,
    title = "Zeit, Wert, Geld",
    subtitle = "Eine begriffliche Analyse der Ökonomie",
    author = "Georg {Röttger}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097656"
}