@book { VorpostendesReichs,
    title = "Vorposten des Reichs?",
    subtitle = "Ostpreußen 1933-1945",
    author = "Christian {Pletzing}",
    year = "2006",
    publisher = "Meidenbauer",
    address = ", Germany",
    url = "https://www.peterlang.com/document/1102261"
}