1. L. R. Verncy , "Overview of Cobalt Supply and Production" PA G. P. Tyrolcr , 1988 , in Extractive Metallurgy of Nickel and Cobalt The Metallurgical Society Warrendale , pp. 135 – 185
2. W. S. Kirk and
D. I. Bleiwas , "Primary Cobalt Production-1987 and 1988" PA G. P. Tyroler , 1988 , Extractive Metallurgy of Nickel and Cobalt, The Metallurgical Society, Warrendale , pp. 13 – 19
3. E. A. Thiers , “High-Technology Metals Under Pressure: Strategies for Nickel and Cobalt”
G. P. Tyroler PA 1988 Extractive Metallurgy of Nickel and Cobalt , pp. 21 – 31
4. J. De Cuyper , Milling of Cobalt Ores-An Overview
G. P. Tyroler , PA 1988 , Extractive Metallurgy of Nickel and Cobalt , pp. 187 – 210
5. G. B. Harris and
S. Monette and
R. W. Stanley , “Hydrometallurgical Treatment of Blackbird Cobalt Concentrate” PA Ol Asare , 1983 , Hydrometallurgy Research Development & Plant Practice TMSAIME, Warrendale , pp. 139 – 150