1. Mackay and Schnellmann, Mineral processing consultancy silica sand, Mines Research Institute, Kuala Lumpur (2000).
2. A. Azimah, The silica-based industry in Malaysia. Paper presented at the Sesi Dialog Mineral (2002).
3. A.S.B. H Hashim and Z.A.B. Sulaiman, Research on resources of ex-tin tailing sand in Perak State, Mineral and Geoscience Department Malaysia, Kuala Lumpur (1999).
4. A. Abdullah, S. Sulaiman, B.T.H.T. Baharudin, M.K.A. Ariffin and Haliza, Mechanical properties of tin tailing sand-clay mixture from Batu Gajah, Perak, Malaysia for making greensand casting mould: Paper presented at the 15th International Conference on Advances in Materials and Processing Technologies (AMPT 2012), Wollongong, (2012).
5. J.R. Brown, Sands and Greensand, Foseco Ferrous Foundryman's Handbook, Butterworth-Heinemann, Oxford, (2003).