Freeman, O. W., & Martin, H. H. (1942). The Pacific Northwest, a regional, human, and economic survey of resources and development. Wiley; Chapman & Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreeman, Otis W., और Howard H. Martin. The Pacific Northwest, a Regional, Human, and Economic Survey of Resources and Development. New York, London: Wiley; Chapman & Hall, 1942.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFreeman, Otis W., और Howard H. Martin. The Pacific Northwest, a Regional, Human, and Economic Survey of Resources and Development. Wiley; Chapman & Hall, 1942.
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