@book { SelfGivingSelfMastery,
    title = "Self-Giving, Self-Mastery",
    subtitle = "St John Paul II on Men, Women and Conjugal Chastity",
    author = "Alan {O'Sullivan OP}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Oxford, United Kingdom",
    doi = "10.3726/b10415",
    url = "https://www.peterlang.com/document/1054852"
}