@book { Das5MinutenBodyAntiAgingProgramm,
    title = "Das 5-Minuten-Body-Anti-Aging-Programm",
    author = "Manuel {Eckardt}",
    year = "2018",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/417472"
}