@book { LebenundFotografiereninIrland2,
    title = "Leben und Fotografieren in Irland (2)",
    author = "Markus {Helfferich}",
    year = "2022",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1253747"
}