@book { AusbildungzumMentor,
    title = "Ausbildung zum Mentor",
    author = "Moritz {Niemeier}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836625685",
    url = "https://m.diplom.de/document/226533"
}