@book { TrainingsplanungCardiofitnessfreine24jhrigeFrau,
    title = "Trainingsplanung Cardiofitness für eine 24-jährige Frau",
    author = "Christian {Scherzberg}",
    year = "2020",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/909322"
}