@book { DerFreiheitsbegriffbeiImmanuelKant,
    title = "Der Freiheitsbegriff bei Immanuel Kant",
    author = "Kristina {Breyer}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638331753",
    url = "https://www.hausarbeiten.de/document/32464"
}