Ellis, John. World War II: A Statistical Survey: The Essential Facts and Figures for All the Combatants. New York: Facts on File, 1993 
Joseph, Frank. The Axis Air Forces: Flying in Support of the German Luftwaffe. Westport, CT: Praeger, 2011
League of Nations. The Armaments Year-Book 1939/40. Geneva: League of Nations, 1940
Mollo, Andrew. The Armed Forces of World War II: Uniforms, Insignia, and Organization. New York: Crown Publishers, 1981
Nedialkov, Dimitar. The Bulgarian Air Force in Action during the Second World War. Sofia: Boyan Savoy, 2001
Neulen, Hans Werner. In the Skies of Europe: Air Forces Allied to the Luftwaffe, 1939-1945. Marlborough, UK: Crowood Press, 2000 
Rajlich, Jiri. Slovakian and Bulgarian Aces of World War 2. Botley, UK: Osprey Publishing, 2004
Weale, Elke C., John A. Weale, and Richard F. Barker. Combat Aircraft of World War Two. London: Bracken Books, 1985
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