@book { ProgrammezurMinderungaggressivenVerhaltensbeiGrundschlern,
    title = "Programme zur Minderung aggressiven Verhaltens bei Grundschülern",
    author = "Isabell {Kallis}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638481991",
    url = "https://www.hausarbeiten.de/document/52498"
}