@book { FedericodaMontefeltroandSigismondoMalatesta,
    title = "Federico da Montefeltro and Sigismondo Malatesta",
    subtitle = "The Eagle and the Elephant",
    author = "Maria Grazia {Pernis} and Laurie {Schneider Adams}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1096443"
}