@book { MajulahGestrandetinSingapur,
    title = "Majulah! Gestrandet in Singapur",
    author = "Silke {Tobeler}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1129118"
}