@book { LeonardoandtheMysteryoftheAlchemistDaVincisCases3,
    title = "Leonardo and the Mystery of the Alchemist: Da Vinci's Cases #3",
    author = "Alfred {Bekker}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Deutschland",
    url = "https://uksakebooks.grin.com/document/313511"
}