1. Amijaya, H. and Littke, R. (2006) Properties of thermally metamorphosed coal from Tanjung Enim area, South Sumatra Basin, Indonesia with special reference to the coalification path of macerals. Internat. Jour. Coal Geol., v.66, pp.77–489
2. Anand, PRAKASH. (1992) Himalayan coals: their nature, composition, formation and rank. Palaeobtanist, v.40, pp.77–489.
3. Bodily, D.M. and Kopp, V. (1987) Characterization of Resinite maceral Fraction. American Chemical society. Fuel Chemistry, v.32, pp.54–557
4. Casshyap, S.M. (1964) Reflectance study of certain coals from the Bokaro Coalfield, Bihar. Proc. National Inst. Sci., India, 30A, pp.816–832
5. Chandra, D. and Srivastava, G.P. (1980) Volatile displacement of Burnt coals. Jour. Geol. Soc. India, v.21, pp.06–310