Aitken, W. H. M. H. (1894). The Difficulties of the Soul, or Hindrances to Believing. New York.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAitken, W. Hay M. H. The Difficulties of the Soul, or Hindrances to Believing. New York, 1894.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAitken, W. Hay M. H. The Difficulties of the Soul, or Hindrances to Believing. New York, 1894.
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