@book { DieFreigeldundFreilandtheorievonSilvioGesell18621930,
    title = "Die Freigeld- und Freilandtheorie von Silvio Gesell (1862-1930)",
    author = "Curt Philipp {Lorber}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107385"
}