@book { EinsendeaufgabezurTrainingslehre,
    title = "Einsendeaufgabe zur Trainingslehre",
    author = "Jannik {Schalin}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/424418"
}