@book { MobbingRechtlicheAspekte,
    title = "Mobbing - Rechtliche Aspekte",
    author = "Ralph {Piller}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832419080",
    url = "https://m.diplom.de/document/217756"
}