@book { DieHaftungsvorschriftender13cunddUStG,
    title = "Die Haftungsvorschriften der §§ 13 c und d UStG",
    author = "Andreas {Friedrich}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103882"
}