@book { EllyDunkleGeheimnisse,
    title = "Elly: Dunkle Geheimnisse",
    author = "Oliver G. {Wolff}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1420636"
}