Johnson, L. W. (2025). Rockhounding Washington: A guide to the state's best sites (Second edition.). Falcon Guides.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Lars W. Rockhounding Washington: A Guide to the State's Best Sites. Second edition. Essex, Connecticut: Falcon Guides, 2025.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Lars W. Rockhounding Washington: A Guide to the State's Best Sites. Second edition. Falcon Guides, 2025.
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