@book { SozialeLerntheorien,
    title = "Soziale Lerntheorien",
    author = "Sanne {Opitz}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640041558",
    url = "https://www.hausarbeiten.de/document/105875"
}