@book { DieNachfragenachBioprodukten,
    title = "Die Nachfrage nach Bioprodukten",
    author = "Maike {Bruhn}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093920"
}