@book { Itsnotwhataleaderdoesitswhatyoumakeofit,
    title = "It's not what a leader does, it's what you make of it",
    author = "Regina {Herzfeldt}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832470159",
    url = "https://m.diplom.de/document/222324"
}