@book { JosephRatzingersTheologicalRetractations,
    title = "Joseph Ratzinger’s Theological Retractations",
    author = "Cong Quy {Lam}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0607-7",
    url = "https://www.peterlang.com/document/1053062"
}