1. Classification of Coal;ISO 11760,2005
2. Methods for the Petrographic Analysis of Coals - Part 2: Methods of Preparing Coal Samples;ISO 7404-2,2009
3. Methods for the Petrographic Analysis of Coals – Part 3: Method of Determining Maceral Group Composition;ISO 7404-3,2009
4. Methods for the Petrographic Analysis of Coal - Part 5: Methods of Determining Microscopically the Reflectance of Vitrinite;ISO 7404-5,2009
5. The nature and fate of natural resins in the geosphere – VII. A radiocarbon (14C) age scale for description of immature natural resins: an invitation to scientific debate;Anderson;Org. Geochem.,1996