@book { ZiemlichbesteGeschwister,
    title = "Ziemlich beste Geschwister",
    subtitle = "Weniger Streit, weniger Chaos, weniger Stress. Geschwister gelassen erziehen",
    author = "Sabrina {Heinke}",
    year = "2020",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/533798"
}