@book { Fotografierenlernen,
    title = "Fotografieren lernen",
    subtitle = "Ganz einfach bessere Fotos, Die 30 Tage Challenge",
    author = "Lars {Poeck}",
    year = "2022",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/451596"
}