@book { KrafttrainingErstellungeinesTrainingsplansfreine27jhrigeFrau,
    title = "Krafttraining. Erstellung eines Trainingsplans für eine 27-jährige Frau",
    author = "Feena {Maier}",
    year = "2020",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/974196"
}