@book { DerJanuskopfdesBrgers,
    title = "Der Januskopf des Bürgers",
    subtitle = "Eine gesellschaftsgeschichtliche Analyse von Ludvig Holbergs Komödie «Jeppe paa Bierget»",
    author = "Hermann {Engster}",
    year = "1979",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070428"
}