Williams, H. (1948). The ancient volcanoes of Oregon. Oregon State System of Higher Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Howel. The Ancient Volcanoes of Oregon. Eugene: Oregon State System of Higher Education, 1948.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Howel. The Ancient Volcanoes of Oregon. Oregon State System of Higher Education, 1948.
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