@book { DerTrainingsraumEvaluationeinerneuenErziehungsmethode,
    title = "Der Trainingsraum. Evaluation einer neuen Erziehungsmethode",
    author = "Jan {Belak}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640589425",
    url = "https://www.hausarbeiten.de/document/148143"
}