@book { ErziehungzurMndigkeit,
    title = "Erziehung zur Mündigkeit",
    subtitle = "Grundzüge der pädagogischen Theorie des Willens",
    author = "Dietmar {Langer}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135359"
}