Merrill, C. W., Henderson, C. W., & Kiessling, O. E. (1937). Small-scale placer mines as a source of gold, employment, and livelihood in 1935. Works Progress Administration, National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMerrill, Charles W., Charles W. Henderson, और O. E. Kiessling. Small-scale Placer Mines as a Source of Gold, Employment, and Livelihood in 1935. Philadelphia: Works Progress Administration, National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques, 1937.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMerrill, Charles W., et al. Small-scale Placer Mines as a Source of Gold, Employment, and Livelihood in 1935. Works Progress Administration, National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques, 1937.