@book { DiedunklenHerzenssind,
    title = "Die dunklen Herzens sind",
    author = "David {Docherty} and Volker {Neuhaus} and Edda {Petri}",
    year = "2020",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/590504"
}