@book { DieMidlifeChance,
    title = "Die Midlife Chance",
    subtitle = "Die Mut-Strategie für die Mitte des Lebens: Neue Herausforderungen, neues Selbstbewusstsein, neues Glück",
    author = "Katrin {Bringmann}",
    year = "2019",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/498565"
}