@book { KinderundJugendlicheinLebenskrisen,
    title = "Kinder und Jugendliche in Lebenskrisen",
    author = "Michael {Thomas}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832400743",
    url = "https://m.diplom.de/document/216029"
}