@book { GeschwisterpositionundPersnlichkeitsentwicklung,
    title = "Geschwisterposition und Persönlichkeitsentwicklung",
    author = "Kerstin {Dupont}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832452407",
    url = "https://m.diplom.de/document/220765"
}