@book { DerLehrereinunmglicherBeruf,
    title = "Der Lehrer – ein (un)möglicher Beruf",
    author = "Gerd-Bodo {von Carlsburg} and Marian {Heitger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099278"
}