1. HYDROMETALLURGY OF STRATEGIC METALS
2. Ritcey, G. M. and Ashbrook, A. W. 1979.Solvent Extraction: Principles and Applications to Process Metallurgy, Part II533–541. Amsterdam: Elsevier Scientific Publishing Co:
3. Gupta, C. K. and Mukherjee, T. K. 1990.Hydrometallurgy in Extraction ProcessesVol. II, 132 ppBoston: CRC Press: