Ballou, B. (1931). Historical map of the state of Washington. Published and copyrighted by the American Association of University Women, Spokane Branch.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBallou, Bertha. Historical Map of the State of Washington. [Spokane, Wash.?]: Published and copyrighted by the American Association of University Women, Spokane Branch, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBallou, Bertha. Historical Map of the State of Washington. Published and copyrighted by the American Association of University Women, Spokane Branch, 1931.
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