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3. Zhemchuchnikov, Yu.A. and Ginzburg, A.I., Osnovy petrografii uglei (Principles of Coal Petrography), Moscow: Izd. AN SSSR, 1960.
4. Stach, E., Mackowsky, M.-T., Teichmuller, M., et al., Stach’s Textbook of Coal Petrology, Berlin: Gebruder Borntraeger, 1975.
5. Manskaya, S.M. and Drozdova, T.V., Geokhimiya organicheskogo veshchestva (Geochemistry of Organic Material), Moscow: Nauka, 1964.