@book { DerKompetenzbegriffundKompetenztransfer,
    title = "Der Kompetenzbegriff und Kompetenztransfer",
    author = "Michael {Estel}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656266501",
    url = "https://www.hausarbeiten.de/document/200449"
}