@book { Handlungsorientierung,
    title = "Handlungsorientierung",
    author = "Ansgar {Deekeling}",
    year = "2003",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640058860",
    url = "https://www.hausarbeiten.de/document/107632"
}