@book { StreetArtinHamburg,
    title = "Street-Art in Hamburg",
    subtitle = "Das subversive Potenzial einer Kunstform",
    author = "Juliane {Goller}",
    year = "2018",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/453972"
}