Piotr Chaadáyev (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Piotr Chaadáyev" in Spanish language version.

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1books.google.com

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books.google.com

J. J. Saunders (2001). The History of the Mongol Conquests. University of Pennsylvania Press. p. 247. ISBN 978-0-8122-1766-7.

wikipedia.org

en.wikipedia.org

Gordon Thomas, Journey Into Madness: Medical Torture and the Mind Controllers (1988)