1. O. T. Benfey , Classics in the Theory of Chemical Combination, Dover Publication, New York, 1963
2. C. A. Russell , The History of Valency, Leicester University Press, New York, 1971
3. P. J. Ramberg , Chemical Structure, Spatial Arrangement: The Early History of Stereochemistry (1874–1914), Ashgate Publishing Company, Burlington, 2003
4. G. N. Lewis , Valence and the Structure of Atoms and Molecules, Chemical Catalog Company, New York, 1923
5. Current trends in the development of A. M. Butlerov’s theory of chemical structure