@book { MedievalBalladryandtheCourtlyTradition,
    title = "Medieval Balladry and the Courtly Tradition",
    subtitle = "Literature of Revolt and Assimulation",
    author = "Gwendolyn {Morgan}",
    year = "1993",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1082451"
}