@book { DasBGBimSchnelldurchlauf,
    title = "Das BGB im Schnelldurchlauf",
    author = "Daniel {Poznanski}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656063933",
    url = "https://www.hausarbeiten.de/document/182667"
}