@book { AmrumistgutfrsHerzVol4,
    title = "Amrum ist gut fürs Herz Vol. 4",
    author = "Sissi {Kaipurgay}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1040919"
}