Mayo, R. F. (1986). A journey with Roy Mayo to the historical mining areas of Washington State: Liberty and Blewett. Nugget Enterprises.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMayo, Roy F. A Journey with Roy Mayo to the Historical Mining Areas of Washington State: Liberty and Blewett. Enumclaw, WA: Nugget Enterprises, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMayo, Roy F. A Journey with Roy Mayo to the Historical Mining Areas of Washington State: Liberty and Blewett. Nugget Enterprises, 1986.
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