Clarke, R. F. (1955). Humility: Thirty short meditations. Catholic Truth Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClarke, Richard F. Humility: Thirty Short Meditations. London: Catholic Truth Society, 1955.
एमएलए (8वां संस्करण) प्रशस्ति पत्रClarke, Richard F. Humility: Thirty Short Meditations. Catholic Truth Society, 1955.
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