@book { ImSchattendesSchamanen,
    title = "Im Schatten des Schamanen",
    author = "Kerstin {Groeper} and Guiseppe {Bruno}",
    year = "2018",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    url = "https://www.heypublishing.com/document/437232"
}