United States. Bureau of Mines & Cornell, W. L. (1987). Continuous flotation testing to recover cobalt from Missouri lead ores. U.S. Dept. of the Interior, Bureau of Mines.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited States. Bureau of Mines এবং W. L. Cornell. Continuous Flotation Testing to Recover Cobalt from Missouri Lead Ores. [Avondale, Md.]: U.S. Dept. of the Interior, Bureau of Mines, 1987.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUnited States. Bureau of Mines এবং W. L. Cornell. Continuous Flotation Testing to Recover Cobalt from Missouri Lead Ores. U.S. Dept. of the Interior, Bureau of Mines, 1987.