@book { Trainingslehre1GesundheitsorientiertesKrafttraining,
    title = "Trainingslehre 1. Gesundheitsorientiertes Krafttraining",
    author = "Lukas {Hübner}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/388135"
}