(1955). Keys to happiness: A Reader's Digest guide to successful living. The Reader's Digest Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKeys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
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