@book { SelbstndigkeitinderLandwirtschaft,
    title = "Selbständigkeit in der Landwirtschaft",
    author = "Franz {Trompedeller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090123"
}