@book { FitnesstrainerBLizenzTrainingsplanungnachILB,
    title = "Fitnesstrainer-B-Lizenz. Trainingsplanung nach ILB",
    author = "Michael {Schäper}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640680832",
    url = "https://www.hausarbeiten.de/document/155867"
}