@book { DaVincisCasesThreeAdventuresofYoungLeonardo,
    title = "Da Vinci's Cases: Three Adventures of Young Leonardo",
    author = "Alfred {Bekker}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Deutschland",
    url = "https://uksakebooks.grin.com/document/313516"
}