@book { Obenistauchnuruntenaberhaltvonoben,
    title = "Oben ist auch nur unten, aber halt von oben",
    author = "Alexander {Liegl}",
    year = "2014",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    url = "https://www.heypublishing.com/document/275232"
}