Ingersoll, G. E. (1933). Small scale methods of placer mining and placer mining districts of Washington and Oregon. State college of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIngersoll, Guy Ernest. Small Scale Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. [Pullman: State college of Washington, 1933.
एमएलए (8वां संस्करण) प्रशस्ति पत्रIngersoll, Guy Ernest. Small Scale Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. State college of Washington, 1933.
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