@book { FachpraktikumArbeitslehre,
    title = "Fachpraktikum Arbeitslehre",
    author = "Nadine {Custer}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656530169",
    url = "https://www.hausarbeiten.de/document/263876"
}