Duffy, A. (1936). The poetry of duty. National Council of Catholic Men.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuffy, Alfred. The Poetry of Duty. Washington, D.C.: National Council of Catholic Men, 1936.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDuffy, Alfred. The Poetry of Duty. National Council of Catholic Men, 1936.
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