@book { ZitronenausFribello,
    title = "Zitronen aus Fribello",
    author = "Yvonne {Lacina-Blaha}",
    year = "2019",
    publisher = "Omnino Verlag",
    address = "Berlin, Deutschland",
    url = "https://shop.omnino-verlag.de/document/501036"
}