@book { EinGentlemanmordetEinklassischerKriminalroman,
    title = "Ein Gentleman mordet – Ein klassischer Kriminalroman",
    author = "Jonas {Pickham}",
    year = "2023",
    publisher = "Bärenklau Exklusiv",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1436793"
}