@book { VonderMotivationstheoriezurMotivationspraxis,
    title = "Von der Motivationstheorie zur Motivationspraxis",
    author = "",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656007395",
    url = "https://www.hausarbeiten.de/document/178600"
}