@book { BeiLesungMord,
    title = "Bei Lesung Mord",
    author = "Monika {Buttler}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822718",
    url = "https://www.heypublishing.com/document/262100"
}