@book { LebenundFotografiereninIrland,
    title = "Leben und Fotografieren in Irland",
    author = "Markus {Helfferich}",
    year = "2022",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1253806"
}