1. Paleobotany: Plants of the past, their evolution;Agashe,1995
2. Studies in Paleobotany;Andrews,1961
3. An Introduction to Paleobotany;Arnold,1947
4. D2797/D2797M-11a Standard practice for preparing coal samples for microscopical analysis by reflected light;ASTM,2011
5. D2798-11a Standard test method for microscopical determination of the vitrinite reflectance of coal;ASTM,2011