Williams, H. (1953). The ancient volcanoes of Oregon (2d ed.). Oregon State System of Higher Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Howel. The Ancient Volcanoes of Oregon. 2d ed. Eugene: Oregon State System of Higher Education, 1953.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Howel. The Ancient Volcanoes of Oregon. 2d ed. Oregon State System of Higher Education, 1953.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.