@book { TrainingsplanungzurSteigerungderAusdauer,
    title = "Trainingsplanung zur Steigerung der Ausdauer",
    author = "Erik {Janus}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/268843"
}