@book { TrainingslehreIIAusdauertraining,
    title = "Trainingslehre II: Ausdauertraining",
    author = "Christina {Reuter}",
    year = "2015",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://m.hausarbeiten.de/document/293286"
}