@book { EinHeimatvereinfrSylt,
    title = "Ein Heimatverein für Sylt",
    author = "Sinje Bogg {Brockmann}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b21101",
    url = "https://www.peterlang.com/document/1414908"
}