@book { HamburgoderHambourg,
    title = "Hamburg oder Hambourg?",
    subtitle = "Amandus Augustus Abendroth – Reformpolitiker und Stadtoberhaupt unter Napoleon",
    author = "Helmut {Stubbe da Luz} and Christian F. {Wurm}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1507397"
}