@book { StenNordDerAbenteurerimWeltraum,
    title = "Sten Nord - Der Abenteurer im Weltraum",
    author = "Ernst {Konstantin}",
    year = "2020",
    publisher = "Blitz-Verlag",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1365396"
}