@book { DerVorgesetztealsCoach,
    title = "Der Vorgesetzte als Coach",
    author = "Steffen {Fischer}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832402020",
    url = "https://m.diplom.de/document/216150"
}