@book { WriterundrechteCliquen,
    title = "Writer und rechte Cliquen",
    author = "Oliver {Bartelds}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640156696",
    url = "https://www.hausarbeiten.de/document/110831"
}