@book { EinSommeraufderSanddorninsel,
    title = "Ein Sommer auf der Sanddorninsel",
    subtitle = "Ein Ostsee-Roman",
    author = "Monika {Detering} and Horst-Dieter {Radke}",
    year = "2021",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/1061055"
}