@book { EinkaufenuntereinemDach,
    title = "Einkaufen unter einem Dach",
    author = "Michael {Reichert}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656354406",
    url = "https://www.hausarbeiten.de/document/208108"
}