@book { KrafttrainingimKindesundJugendalter,
    title = "Krafttraining im Kindes- und Jugendalter",
    author = "Andreas {Gröger}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/285750"
}