@book { HrstdumichJulia,
    title = "Hörst du mich, Julia?",
    subtitle = "Psycho-Krimi",
    author = "Johanna {Thal}",
    year = "2017",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    url = "https://www.heypublishing.com/document/381079"
}