@book { DieProjektmethodeEinberblick,
    title = "Die Projektmethode: Ein Überblick",
    author = "Sabrina {Wehrl}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656552819",
    url = "https://www.hausarbeiten.de/document/265718"
}