@book { ErdgeschichtezumAnfassen,
    title = "Erdgeschichte zum Anfassen",
    author = "Sabrina {Krieger}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832458683",
    url = "https://m.diplom.de/document/221328"
}