@book { AdamMickiewiczalsDramatiker,
    title = "Adam Mickiewicz als Dramatiker",
    author = "Gerda {Leber-Hagenau}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1087243"
}