@book { HelenasVermchtnisEinhistorischerFantasyRoman,
    title = "Helenas Vermächtnis – Ein historischer Fantasy-Roman",
    author = "Rainer {Keip}",
    year = "2023",
    publisher = "Bärenklau Exklusiv",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1339860"
}