Gray, W. H. (1913). The unpublished journal of William H. Gray from December, 1836, to October, 1837. Whitman College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGray, W. H. The Unpublished Journal of William H. Gray from December, 1836, to October, 1837. Walla Walla: Whitman College, 1913.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGray, W. H. The Unpublished Journal of William H. Gray from December, 1836, to October, 1837. Whitman College, 1913.
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