@book { DasRegenbogenvterbuch,
    title = "Das Regenbogenväterbuch",
    author = "Gianni {Bettucci} and Sören {Kittel} and Ulrich Michael {Heissig} and Alexander {Schug}",
    year = "2020",
    publisher = "Omnino Verlag",
    address = "Berlin, Deutschland",
    url = "https://shop.omnino-verlag.de/document/704187"
}