@book { DieKnotlingeDerDrachengasnotstand,
    title = "Die Knotlinge - Der Drachengasnotstand",
    author = "Bernhard {Kalthoff}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1040914"
}