Williams, J. H. (1912). The guardians of the Columbia: Mount Hood, Mount Adams and Mount St. Helens. J. H. Williams.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, John H. The Guardians of the Columbia: Mount Hood, Mount Adams and Mount St. Helens. Tacoma: J. H. Williams, 1912.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, John H. The Guardians of the Columbia: Mount Hood, Mount Adams and Mount St. Helens. J. H. Williams, 1912.
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