Erik Buyst, Kondratiev, Nikolai (1892–1938), Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Gale Publishing, via Highbeam, January 1, 2006.
Grinin, L. E., Devezas, T., and Korotayev A. V. Introduction. Kondratieff's Mystery. In Kondratieff Waves. Dimensions and Prospects at the Dawn of the 21st Century ed. by Grinin, L. E., Devezas, T., and Korotayev A. V. Volgograd: Uchitel. Pp. 5-22 [1]
