@book { VonderIchAnalysezurMassenpsychologie,
    title = "Von der Ich-Analyse zur Massenpsychologie",
    author = "Nicolai {Bühnemann}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640346813",
    url = "https://www.hausarbeiten.de/document/128264"
}