@book { EuropeanRhineRiverCruiseTravelGuide,
    title = "European Rhine River Cruise Travel Guide",
    author = "Ashok {Kumawat}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1420091"
}