O'Brien, I. (1943). The Third Order of Saint Francis: Instrument of peace. National Secretary of the Third Order.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Brien, Isidore. The Third Order of Saint Francis: Instrument of Peace. St. Louis, Mo.: National Secretary of the Third Order, 1943.
एमएलए (8वां संस्करण) प्रशस्ति पत्रO'Brien, Isidore. The Third Order of Saint Francis: Instrument of Peace. National Secretary of the Third Order, 1943.
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