APA

Richards R. H. 1., .Ore dressing / by Robert H. Richards, S. B. professor of Mining Engineering and Metallurgy at the Massachusetts Institute of Technology, Boston, Mass., U. S. A. New York and London : The engineering and mining journal, 1906: .

Chicago

Richards Robert Hallowell 1844-1945, .Ore dressing / by Robert H. Richards, S. B. professor of Mining Engineering and Metallurgy at the Massachusetts Institute of Technology, Boston, Mass., U. S. A. New York and London : The engineering and mining journal, 1906: .

Harvard

Richards R. H. 1., .Ore dressing / by Robert H. Richards, S. B. professor of Mining Engineering and Metallurgy at the Massachusetts Institute of Technology, Boston, Mass., U. S. A. New York and London : The engineering and mining journal, 1906: .

MLA

Richards Robert Hallowell 1844-1945, .New York and London : The engineering and mining journal, 1906: . .