O'Callaghan. Children of God in the World. The Catholic University of America Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Callaghan. Children of God in the World. The Catholic University of America Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रO'Callaghan. Children of God in the World. The Catholic University of America Press.
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