Ramsey, G. R. (1977). Postmarked Washington, Okanogan county. Okanogan County Historical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRamsey, Guy Reed. Postmarked Washington, Okanogan County. [Omak, Wash.]: Okanogan County Historical Society, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRamsey, Guy Reed. Postmarked Washington, Okanogan County. Okanogan County Historical Society, 1977.
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