1. Methods for the Analysis of Coal and Coke,1973
2. Methods for the Analysis and Testing of Coal and Coke — Proximate Analysis of Hard Coal,1979
3. Methods for the Analysis and Testing of Coal and Coke — Anslysis of Coal Ash, Coke Ash and Mineral Matter;Australian Standard 1039,1981
4. ISO 1171–1981 Solid Mineral Fuels-Determination of Ash. Geneva. International Organisation for Standardization