@book { DerZeitkristallGruselKrimi,
    title = "Der Zeitkristall: Grusel-Krimi",
    author = "Frank {Rehfeld}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Deutschland",
    url = "https://uksakebooks.grin.com/document/512766"
}