@book { SelbstbehauptunginZeitenderZwnge,
    title = "Selbstbehauptung in Zeiten der Zwänge",
    subtitle = "Jahrgang 1928",
    author = "Eberhard {Mannack}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136251"
}