Eckel E. C. Edwin C. (1914). Iron ores: Their occurrence, valuation and control (First ed.). New York, McGraw-Hill Book Company, 1914.
Lua i Stíl Chicago (17ú heag.)Eckel E. C. Edwin C. Iron Ores: Their Occurrence, Valuation and Control. First ed. New York, McGraw-Hill Book Company, 1914, 1914.
Lua MLA (9ú heag.)Eckel E. C. Edwin C. Iron Ores: Their Occurrence, Valuation and Control. First ed. New York, McGraw-Hill Book Company, 1914, 1914.
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