1. Dalvi, Ashok D, W Gordon Bacon, and Robert C Osborne. The Past and The Future of Nickel Laterites. International Convention, 1-7, (2004).
2. Siti Rochani and Nuryadi Saleh. Nickel Processing and Refining Technology. Jakarta : Center of Minerals and Coals Research Development, (2013). – In Bahasa
3. Crundwell, F. K. Extractive Metallurgy of Nickel, Cobalt and Platinum-Group Metals. (Elsevier Ltd, Amsterdam, 2011)
4. Whittington, B., Muir, D., Extractive Metall. Rev. International Journals, 21, 527–599 (2000).
5. Kyle, J. Nickel laterite processing technologies. Nickel/Cobalt/Copper Conference. Perth, Western Australia: In: ALTA (2010).