@book { InterpretationderTopographischenKarte150000BlattL4318Paderborn,
    title = "Interpretation der Topographischen Karte 1:50000 Blatt L4318 Paderborn",
    author = "Alexa {Saße}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638814829",
    url = "https://www.hausarbeiten.de/document/76007"
}