^García, Dionisío (September 2004). "Renault FT 17 en España (2): La Guerra Civil". Madrid, Spain: Almena. pp. 6–7.
^Hofmann, George (1 January 1998). "The Tactical and Strategic Use of Attaché Intelligence: The Spanish Civil War and the U.S. Army's Misguided Quest for a Modern Tank Doctrine" in Journal of Military History. Society for Military History. pp. 103–104.