@book { PerspectivesinJurisprudence,
    title = "Perspectives in Jurisprudence",
    subtitle = "An Analysis of H. L. A. Hart's Legal Theory",
    author = "Eric J. {Boos}",
    year = "1998",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1087516"
}