@book { UniversellerTrainingsplanfrdasKrafttraining,
    title = "Universeller Trainingsplan für das Krafttraining",
    author = "Simon {Schubert}",
    year = "2016",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/313906"
}