@book { TransnationalLongfellow,
    title = "Transnational Longfellow",
    subtitle = "A Project of American National Poetry",
    author = "Armin Paul {Frank} and Christel-Maria {Maas}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Allemagne",
    url = "https://www.peterlang.com/document/1099373"
}