@book { ACaseStudyontheImplementationofSixSigmawithinStarwoodHotelsResorts,
    title = "A Case Study on the Implementation of Six Sigma within Starwood Hotels & Resorts",
    author = "William {Gemkow}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640848096",
    url = "https://www.hausarbeiten.de/document/167854"
}