@book { IdentittstheoriebeiEriksonundFreud,
    title = "Identitätstheorie bei Erikson und  Freud",
    author = "",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656202745",
    url = "https://www.hausarbeiten.de/document/194869"
}