Birkby, J. (2021). Touring hot springs Washington and Oregon: The states' best resorts and rustic soaks (Third edition.). Falcon Guides.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirkby, Jeff. Touring Hot Springs Washington and Oregon: The States' Best Resorts and Rustic Soaks. Third edition. Guilford, Connecticut: Falcon Guides, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirkby, Jeff. Touring Hot Springs Washington and Oregon: The States' Best Resorts and Rustic Soaks. Third edition. Falcon Guides, 2021.
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