Scofield, J. (1993). Hail, Columbia!: Robert Gray, John Kendrick, and the Pacific fur trade. Oregon Historical Society Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रScofield, John. Hail, Columbia!: Robert Gray, John Kendrick, and the Pacific Fur Trade. Portland, OR: Oregon Historical Society Press, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रScofield, John. Hail, Columbia!: Robert Gray, John Kendrick, and the Pacific Fur Trade. Oregon Historical Society Press, 1993.
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